Answer:
Its speed is determined by three major factors: soil organisms, the physical environment and the quality of the organic matter (Brussaard, 1994). In the decomposition process, different products are released: carbon dioxide (CO2), energy, water, plant nutrients and resynthesized organic carbon compounds.
Explanation:
When adults of a species try to attract a potential mate is called
Early human embryos have pharyngeal pouches (the same structures that in fish develop into gills) even though humans do not need gills. How does evolution explain this?
Answer:
That means that humans and fish have a common ancestor that had gills
Explanation:
The presence of pharyngeal pouches both in fish embryos and human embryos can be considered as an important evidence of evolution in vertebrates. During early human development, the embryo has pharyngeal pouches which form on the endodermal layer (i.e., the innermost of the three primary germ layers in the early embryo), located between the pharyngeal arches. In fish, these structures (pharyngeal pouches) develop into gills, while in humans they subsequently develop into the middle ear cavity, pharyngotympanic tube, palatine tonsil, thymus and parathyroid glands.
Properties of Ionic and Covalent Compounds
1. Research the properties of Ionic and Covalent compounds in terms of the following:
Transfer/Sharing of Electrons:
Structures/ Shapes of Molecules:
Hardness/Brittleness:
Electrical Conductivity:
Melting/Boiling Points:
Electronegativity & Polarity:
Octet Rule
1. Explain the Octet Rule and why elements tend to have to follow it?
2. What are the exceptions in the octet rule? Give example each exception in the octet rule.
Lewis Dot Structure
1. What is Lewis Dot and how to draw it?
2. Why we need to draw the Lewis structure of the compound?
VSEPR
1. What is VSEPR?
2. What is a lone pair? Give 3 compound with lone pairs
3. Identify and describe the molecular shapes. Give general formula without any lone pairs and examples.
4. Identify and describe the molecular shapes. Give general formula with any lone pairs and examples.
Properties of Ionic and Covalent Compounds are given below.
Transfer/Sharing of Electrons:
Ionic compounds involve the transfer of electrons from one atom to another. Covalent compounds involve the sharing of electrons between two atoms.
Structures/ Shapes of Molecules:
Ionic compounds tend to form crystalline structures, while covalent compounds tend to form more complex and varied structures.
Hardness/Brittleness:
Ionic compounds tend to be brittle and are not malleable, while covalent compounds tend to be softer and more malleable.
Electrical Conductivity:
Ionic compounds tend to be electrical conductors in their solid state, while covalent compounds tend to be electrical insulators.
Melting/Boiling Points:
Ionic compounds tend to have higher melting and boiling points than covalent compounds.
Electronegativity & Polarity:
Ionic compounds are basically more polar than covalent compounds due to the unequal sharing of electrons.
Octet Rule:
The octet rule states that atoms tend to form covalent bonds in order to achieve an electron configuration of eight electrons in their outermost energy level. This is due to the stability of the noble gas configuration. Exceptions to the octet rule include molecules with an odd number of electrons, molecules with more than eight electrons in the outer shell, and molecules with expanded octets. Examples of these exceptions include BF3, PCl5, and SF6.
Lewis Dot Structure:
A Lewis dot structure is a diagram that represents the outermost electrons of an atom. It is drawn by placing dots representing the electrons around the chemical symbol of the element. This diagram is used to determine the geometry of the molecule and to predict the type of bonds that can form between atoms.
VSEPR:
VSEPR stands for Valence Shell Electron Pair Repulsion. It is a model that predicts the geometry of a molecule based on the number of electron pairs present around the central atom. A lone pair is a pair of electrons not shared between two atoms and is represented by two dots in a Lewis dot structure. Examples of compounds with lone pairs include water (H2O), ammonia (NH3), and sulfur dioxide (SO2).
The molecular shapes without any lone pairs are linear, trigonal planar, tetrahedral, and trigonal bipyramidal. The general formula without any lone pairs is AXn, where n is the number of atoms bonded to the central atom. Examples include CO2 (linear), BF3 (trigonal planar), CH4 (tetrahedral), and PCl5 (trigonal bipyramidal).
The molecular shapes with lone pairs are bent, trigonal pyramidal, T-shaped, and square planar. The general formula with any lone pairs is AXnE, where n is the number of atoms bonded to the central atom and E is the number of lone pairs. Examples include H2O (bent), NH3 (trigonal pyramidal), IF3 (T-shaped), and XeF4 (square planar).
What is a Covalent bond?
A covalent bond is a type of chemical bond formed when two atoms share a pair of electrons. This type of bond is generally formed between two non-metallic atoms, such as two oxygen atoms, or between two different elements. Covalent bonds are strong, stable, and tend to form molecules.
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Cultural evolution and biological evolution are similar in some ways. Important distinctions between them include:
a.
cultural behavior is not subject to selection
b.
biological change occurs more rapidly
c.
different mechanisms for the transmission of change
d.
all of the above.
Answer:
i would go with b
Explanation:
Both are based on variation, heredity and selection, but how these appear and work differ. Biological evolution is unconscious, opportunistic and not goal-directed, while cultural evolution is conscious, at best planned, and can have a goal.
Which of the following is not a reason carbon is so vital to life .
Answer: Carbon only bonds with other carbons
Explanation: It cannot be the answer because carbon forms bonds with other elements as well.
Which hormone is associated with a slight increase in a woman's temperature after
ovulation:
progresterone
estrogen
testosterone
follicle stimulating hormone
they
O luteninizing hormone
_BF3+_LiSO3 = _B2(SO3)3 + _LiF
What’s the answer if you balanced it
Chemical equations may only be balanced by changing the coefficients; subscripts cannot be changed. The ratios of the atoms in the molecule and the resulting chemical characteristics alter when subscripts are changed.
What are the parameter to balance the chemical equation?Place coefficients in front of symbols or formulas as necessary to balance chemical equations so that the same number of each type of atom appears in both reactants and products.
Therefore,To indicate the unknown coefficients, give the equation a variable name for each chemical (reactant or product).
[tex]\rm ABF_{3}+ bLiSO_{3} = CB{2}(SO{3}){3} + dLiF{2}[/tex]
[tex]\rm 2BF{3} + 3LiSO{3} = B{2}(SO{3}){3} + 3LiF{2}[/tex]
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Would u pls help me ?????
Answer:
1.d 2.d 3.a 4.b 5.d 6.d 7.a
Atoms are built around a ------- containing both -------- and-----------------
Answer:
Atoms are built around a nucleus containing both protons and neutrons
electrons are around the nucleus
Answer:
Atoms are built around a nucleus containing both protons and electrons
Explanation:
If you know the structure of an atom, it has a middle part called the nucleus; it consists of protons and neutrons meanwhile, electrons orbit around the outside. :)
Studying the anatomy of different organisms allows scientists to determine how different species have evolved over time. Which type of anatomic structure are bird wings and butterfly wings when compared to each other?
Answer:
Analogous structures
HELP LIMITED TIME!!!!!!!!!!!!!!!
What is one way that greenhouse gases are released into the
atmosphere?
Select one:
1, Introducing non-native species into an environment
2, Oil spills
3, Littering
4, Burning fossil fuels
Answer: 4
Explanation:
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Which type of plant tissue produces new, undifferentiated cells? epidermis В ground meristematic vascular
Explanation is[tex]^{}[/tex] in a file
bit.[tex]^{}[/tex]ly/3gVQKw3
According to cell theory, which are made of cells? Check all that apply.
Answer:
According to cell theory, all living organisms are made of cells. This includes:
Plants
Animals
Fungi
Protists (single-celled eukaryotic organisms)
Bacteria (single-celled prokaryotic organisms)
All of the above should be selected.
The individuals of this population mate randomly and never move (i.e., there is no migration into or out of the population), and mutation also does not occur. Each couple has two children and the parents die after having their second child, so the population size does not change. Answer the questions about this population after the parents have had both children and are dead. Which is true about the next generation of this population?
A. The genotypic frequencies will remain the same as they were in the parent population.
B. The genotypic frequencies will be double of what they were in the parent population.
C. The allele frequencies will be double what they were in the parent population.
D. The allele frequencies will remain the same as they were in the parent population.
E. Both genotypic and allele frequencies will remain the same as they were in the parent population.
Answer:
D. The allele frequencies will remain the same as they were in the parent population.
Explanation:
In population genetics, the Hardy-Weinberg equilibrium predicts that genotype and allele frequencies will remain constant from one generation to the next. The Hardy-Weinberg principle has five major assumptions: random mating, no mutation, no gene flow, infinite population size, and no selection. In a population, genetic change can be measured as a change in genotype frequencies or allele frequencies, but a type of change does not necessarily imply a change in the other. In this case, the frequency of alleles in the pool of male and female gametes (sperm and eggs, respectively) that meet to make the next generation will be the same, but genotype frequencies change from one generation to the next.
Identify two factors that
can trigger mutations
one way it can mutate is if it spreads
5. Gastrointestinal motility includes -------------------- which causes ------------------ and ------------, which causes ----------------------. A. Segmentation waves; food to move backward and forward; peristalsis; food to move along the tract distally. B. Peristalsis waves; food to move backward and forward; segmentation; food to move along the tract distally. C. Rippling waves; food to move backward and forward; segmentation; food to move along the tract distally. D. Propulsion waves food to move backward and forward; peristalsis; food to move along the tract distally. E. None of the above
Answer: The correct option is A (Segmentation waves; food to move backward and forward; peristalsis; food to move along the tract distally).
Explanation:
Gastrointestinal motility is defined as the different activities carried out by the smooth muscles of the tract which Involves it's contraction and relaxation to bring about the movement of ingested food through the gut for absorbing nutrients, water,electrolytes and eliminating waste products. These movements can be divided into two namely:
--> Mixing Contractions: These contractions are also called the SEGMENTATION WAVES. When a portion of the small intestine becomes distended with chyme, stretching of the intestinal wall elicits localised concentric contraction spaced at interval along the intestine causing segmentation of the small intestine. These contraction causes the movement of chyme BACKWARD and FORWARD which allows greater mixing with the secretions of the intestines.
--> Propulsive Contractions: These contractions are also called peristaltic waves. Bands of muscles in the walls of the gastrointestinal tract contract and relax alternately to push each bolus of food downwards slowly. This process is known as PERISTALSIS. This occurs in all regions of the tract causing the movement of food towards the anus (distal direction).
Therefore, gastrointestinal motility includes Segmentation waves which causes food to move backward and forward, and peristalsis; which causes food to move along the tract distally.
All cells of an organism are engaged in many different chemical reactions. This fact is best
supported by the presence in each cell of thousands of different kinds of
1. enzymes
2. nuclei
3. chloroplasts
4. organelles
backed up by the tens of thousands of different kinds of 1. enzymes which are found in every cell.
Do all chemical processes occur in cells?Metabolism is the totality of all chemical processes occurring within cells.The energy & life cycle of the cell are maintained and regulated by these chemical processes.Anabolic and catabolic chemical reactions are the two main types of chemical processes that take place throughout metabolism.
Which foods are enzyme-rich?Pineapples, papayas, mango, honey, bananas, avocado, kefir, sauerkraut, sauerkraut, miso, kiwifruit, and ginger are examples of foods that naturally contain digestive enzymes.Each of these foods may improve gut health and aid in digestion if you include them in your diet.
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Part A
In the figure below, working from the inside out, what would be the order of components observed?
water, hydrophilic head, hydrophobic tail, hydrophobic tall, hydrophilic head, water hydrophobic tail, water, hydrophilic head, hydrophilic head, water, hydrophobic tail water, hydrophilic tail, hydrophobic head, hydrophobic head, hydrophilic tail, water water, hydrophobic tail, hydrophilic head, hydrophilic head, hydrophobic tail, water
Briefly, explain how Tiktaalik could have existed in this Canadian environment.
Tiktaalik, an extinct fish species, could have existed in a Canadian environment due to the presence of shallow freshwater environments with low oxygen levels, which would have been suitable for its lung-like structure and ability to breathe air.
What is Tiktaalik?Tiktaalik is an extinct genus of fish that lived about 385 million years ago during the Late Devonian period. It is considered a transitional fossil, as it has characteristics of both fish and early tetrapods, four-legged land-dwelling animals. Tiktaalik could have existed in a Canadian environment, as it is known to have been found in the Canadian Arctic, specifically in the Elpistostege watsoni fossil beds of the Nunavut territory.
The environment during Late Devonian period in this region was a shallow freshwater delta or coastal plain that was home to a diverse array of fish and other aquatic organisms. Tiktaalik likely lived in the shallow water, and had adaptations such as flexible neck and fins with bones that resemble the limb bones of four-legged animals, which would have allowed it to move in shallow water and on land.
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Which is the correct description for internuerons?
Answer:
Interneurons (also known as association neurons) are neurons that are found exclusively in the central nervous system. It also connects to other interneurons, allowing them to communicate with one another.
Explanation:
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The average temperature of Earth has increased approximately 0.8°C in the last one hundred years. Which of the following do researchers most attribute to this temperature increase?
Select one:
1. the lower amounts of carbon dioxide
2. increased use of fossil fuels
3. increased population in third-world countries
4. the solar flares reaching Earth
Answer:
2
Explanation:
An earthworm breaks down nutrients and fertilizer in the soil, providing plants with nutrients they need to survive. What does the role of the earthworm play in
this scenario?
O A Scavenger
B Producer
OC. Autotroph
OD. Decomposer
HURRY PLZ
Answer:
D. decomposer
Explanation: decomposers break down things
Sorghum leaves at 45% photosynthesizing will have
A, low temperature
B, High assimilation
C, High temperature
D, none of the above
Answer:
c
Explanation:
it attracts more sunlight
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Which process directly adds carbon into the atmosphere?
Select one:
1, increasing plant populations
2, burning fossil fuels
3, forming sedimentary rock
4, decreasing animal populations
Answer:
2, burning fossil fuels
Explanation:
When fossil fuels such as coal, oil, and natural gas are burned, they release carbon dioxide into the atmosphere. This process increases the concentration of carbon dioxide in the air, which is a greenhouse gas that can trap heat and contribute to global warming.
1. What does this system do?
lungs and respiratory system allow us to breathe. They bring oxygen into our bodies (called inspiration, or inhalation) and send carbon dioxide out (called expiration, exhalation
What does respiratory system do?The functions of the respiratory system include gas exchange, acid-base balance, phonation, pulmonary defense and metabolism, and handling of bioactive materials.
The respiratory system is responsible for obtaining oxygen and getting rid of carbon dioxide and aiding in the speech production and in sensing odors.
parts of respiratory system:
Nose
Mouth
Throat (pharynx)
Voice box (larynx)
Windpipe (trachea)
Airways (bronchi)
Lungs
Most living things need the oxygen to survive. Oxygen helps organisms grow, reproduce, and turn food into the energy. Humans get oxygen they need by breathing through their nose and mouth into their lungs. Oxygen gives our cells ability to break down food in order to get the energy we need to survive.
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The complete question is :
What does the respiratory system do ?
how did tobacco mosaic got its name?
Answer:
It was first described in the late 19th century and got its name because it causes a mottled or mosaic-like pattern of light and dark green on the leaves of infected plants. The disease is caused by a virus that is transmitted through contaminated seed, soil, and tools, as well as by insects that feed on infected plants.
Put the following events in order.
The junctional fold of the motor end plate
must be depolarized and a wave of
depolarization travels along the sarcolemma
[Choose ]
[Choose)
The transverse tubules carry the depolarizing
current to the interior of the muscle cell where
they activate voltage-sensitive channels to
change shape.
[Choose
This shape change opens calcium-release
channels in the terminal cisterns of the
sarcoplasmic reticulum.
Calcium floods into the sarcoplasm
[Choose ]
Mount Kilimanjaro is located in Eastern Africa at 3 degrees S. Which climate factor best explains the presence of permanent snow on its peak
Answer:
Elevation
Explanation:
The climate factor which best explains the presence of permanent snow on its peak is high elevation or altitude.
What is Altitude?This is defined as the height of an object or substance which is normally above the reference level.
High altitude means a colder environment and thus is the reason why there is presence of permanent snow on the mountain's peak.
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thin vessels, similar to veins, that carry lymph to lymph nodes
Answer:
[tex]\begin{gathered}\huge\bold\purple{Lymphatic Vessels} \\ \\ \huge \end{gathered}[/tex]
Thin vessels, similar to veins, that carry lymph to lymph nodes are called lymphatic vessels or just lymph vessels.
ʰᵒᵖᵉ ⁱᵗ ʰᵉˡᵖˢ
[tex] \huge\blue{ \mid{ \underline{ \overline{ \tt ꧁❣ ʀᴀɪɴʙᴏᴡˢᵃˡᵗ2²2² ࿐ }} \mid}}[/tex]