PLZ HELP WITH SCIENCE WORK Don't give me a link Plz JUST ANSWER
A letter to the editor is a statement of your opinion on an issue about which you feel strongly. Choose two events that you believe pulled the nation furthest apart in the mid-1800s. Write a letter to the editor about those events. Use your Lesson 21 Notes to pick 2 events. Your letter should be written from the time period of your event and should:
·have an appropriate date.
·include your (fictitious) name and where you live.
·be two paragraphs{5-7 Sentences} long. (One for each Event)
·briefly describe the events in one or two sentences. (Start each paragraph with a ·brief description of the event)
·explain why you believe this event pulled the nation apart and eventually led to civil war.
·be free of grammatical and spelling errors.

Answer:

i believe it would be a because of stalagtites and stalagmites but i'm not 00% sure

Explanation:

Answer:

because eventually the population of fish will decrease because they are having a hard time breathing in such hot temperature.

Explanation:

(brainliest plz)*

Answer:

it would be b. displacement

Answer:

DNA

Explanation:

One of the genetic diseases known as sickle cell disease is sickle cell anemia. Red blood cells, which deliver oxygen to every region of the body, are affected in terms of structure.

Red blood cells can flow through blood veins with ease. Red blood cells with sickle or crescent shapes are characteristic of sickle cell anemia.

Additionally, these sickle cells develop a hard and sticky coating that can hinder or delay blood flow.

Most persons with sickle cell anemia are incurable. Treatments can reduce suffering and aid in avoiding disease-related consequences.

Therefore, One of the genetic diseases known as sickle cell disease is sickle cell anemia. Red blood cells, which deliver oxygen to every region of the body, are affected in terms of structure.

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Answer:

A gene is composed of a sequence of nucleotides, which are the building blocks of DNA. Each gene contains the information needed to construct a specific protein, which performs a specific function in the body. Genes are passed from parent to offspring and contain the instructions that make each species unique.

Explanation:

Answer:

Plasma membrane

Explanation:

Answer:

Answer D. Scratching it with other materials

Explanation:

Let's start eliminating some answers

Answer A; If you hit an object with a hammer, you will just figure out if that object can be broken with a certain amount of force. In most cases, this will not be helpful.

Answer B; When putting a material in an acid, many things could happen. This things that happen are called chemical reactions. Not every material will have a chemical reaction so this step could be useless.

Answer C; Chipping a piece off of a material will not grant you much information. Yes if may be easier to experiment will a smaller piece but the action by it's self is not useful.

Answer D; Scratching a material will another material can be very helpful. If you have two materials, labeled A and B, you can find out the Mohs hardness scale. If A is damaged by B, the hardness of A is less than B and vise versa. This can be very helpful when identifying materials.

So answer D makes the most sense

Answer: Pure line plant

Explanation:

Pure line plants are those plants that are used for breeding and selecting organisms with a desire trait to a number of generations until the wanted trait is established. Mendel had chosen pea plant for his experiments and that was a pure line species. It was bred to many generations so as to obtain the desired trait in successive generation. The plants were utilized to study the laws of inheritance. Also it was noticed that one trait being recessive in one generation will be expressive in other generation.

Answer:

Serve to transfer signals between cells.

Explanation:

Intercalated disc also called gap junctions are structural formations that are located between the myocardial cells of the heart. They help to bond or connect cardiac cells fibers together. They also help in cell to cell communications and propagate action potential. They serve to transfer signals between cells.

Answer:

Exchange of gases takes place at alveoli sacs of lungs, which are equipped with capillary vessels or bed.

Explanation:

On inspiration or taking air through nostrils, surrounding air enters the lungs and it reaches air sacs or alveoli. Here, the outside air will have more amount of oxygen when compared with oxygen in blood at that site. Hemoglobin in the blood have high bonding capability to oxygen, so it captures oxygen and takes it to heart for pumping into other parts of the body. Likewise, the circulations continues from lungs to heart > hear to body parts > body parts to heart > heart to lungs for purification.

All of an organism's characteristics are inheritable which evolves over millions of years. An example of this is the modern day horse's foot.

This is referred to as the change in the heritable characteristics of biological populations over successive generations.

All an organism's characteristics can be inherited and evolves over a period of time as a result of the changing environmental conditions which helps them to adjust thereby increasing their chances of survival hence preventing extinction of species.

For example, over millions of years of evolution, many horses lost their side toes and developed a single hoof as a result of them needing to move at faster speeds to evade predators.

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Answer:

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Explanation:

Answer:

[tex]{\boxed{\boxed{\tt { Arteries}}}} \ [/tex]

✏ Arteries are the vessels that carry blood away from the heart to various organs of the body.Since, the blood emerges from the heart under high pressure, the arteries have thick, elastic walls.

[tex] \huge \boxed{\mathbb{QUESTION} \downarrow}[/tex]

[tex] \huge \boxed{\mathfrak{Answer} \downarrow}[/tex]

According to the NCERT book (the Indian CBSE school textbooks) :-

About 80% of the population can determine their blood type from saliva, tears, sweat or milk. These are known as secretors, and they refer to the fact that antigens present in the blood can also be found in bodily fluids like saliva.

Your immune system uses antigens as markers to determine whether or not something in your body is hazardous. Viruses, bacteria, cancers, and healthy bodily cells all include antigens. Antigen testing is carried out to identify viral infections, keep an eye on specific illnesses, screen for them, and ascertain a donor's compatibility with a transplant.

The term "secretor status" describes whether water-soluble ABO blood group antigens are present or absent in a person's body fluids, including saliva, tears, breast milk, urine, and semen. People are classified as secretors or non-secretors depending on whether they secrete certain antigens in their body fluids.

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Explanation:

salinity

from

http://sc6thgradescience.weebly.com/uploads/3/0/9/8/30980165/week_8_plant_booklet_new_standards.pdf&ved=2ahUKEwj0-7jr-LrwAhXPQs0KHVFnDNIQFjAAegQIAxAC&usg=AOvVaw26-9xULp2xjBb4NLgg8Arc

When red cattle breed with red cattle, the resultant offspring show both red and white fur, resulting in a mixed coat pattern called "roan."

The roan pattern, normally in Shorthorn cattle, is inherited as a heterozygous genotype. Roaming is usually the intermixing of two dissimilar colored hairs - black and white make a blue roan while red and white make a red roan.

The roan coat color in livestock species is distinguished by a mixture of white and tint hair in cattle, If it is a breed that has the roan color pattern, like a Shorthorn, then yes it can be pure-blooded. Or it can be a cross-breed with the roan color pattern. Roan is a color, not a breed.

So we can conclude that Roan" mentions a horse coat color pattern characterized by a mixture of colors.

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Punnett squares represent the possible genotypes of the offspring according to the parental's gamete combinations. The number of gametes depend on the number of alleles and traits considered.  A) New rows and columns were added to the square because each parent contributed with four types of gametes (4 rows and 4 columns). B) The square would be constructed with eight rows and eight columns.

The Punnett square is a graphic representation that shows the different types of gamete combinations according to the alleles involved in a cross.

Punnett squares are composed of columns and rows in which all the different potential gametes are placed.

The intersection between each column and row suggests a possible genotype among the offspring.

The number of columns and rows will depend on the number of genes involved in the cross. We can use the formula 2ⁿ to figure out how many gametes are possible (2 is the number of alleles, and n is the number of genes). Assuming diallelic genes,

Punnett squares shows the probabilities of getting offspring with different genotypes and their consequent phenotypes.

In the exposed example, we need to compare a punnett square in which we consider only one gene with a punnett square in wich two genes are considered.

From activity 4: Punnett square

Cross: Purple with yellow

Parentals) PP   x   pp

Gametes)   P   P    p    p

Punnett square)

                          P     P

                   p    Pp   Pp

                   p    Pp   Pp

F1) 100% purple kernels, Pp.

Cross: Heterozygous purple kernels from F1

Parentals) Pp   x  Pp

Gametes) P   p    P    p

Punnett square)

                P      p

          P   PP   Pp

          p   Pp   pp

F2) 75% Purple (PP + Pp) and 1/4 yellow kernels (pp)

In these crosses, we only consider one diallelic gene that expresses complete dominance.

Punnett squares are composed of two columns and two rows in which both types of gametes are located.

Now, we need to consider two genes (P and S), which means four alleles are involved and four type of gametes are possible.

Cross: Between two dihybrid individuals

Parentals)        PpSs         x           PpSs

Gametes) PS, Ps, pS, ps        PS, Ps, pS, ps

Punnett square)    

                           PS          Ps          pS          ps

               PS     PPSS     PPSs      PpSS     PpSs

               Ps      PPSs     PPss      PpSs      Ppss

               pS     PpSS     PpSs      ppSS      ppSs

               ps     PpSs      Ppss       ppSs      ppss

F1)

Now, we need to compare Punnett squares from activity 4 (one trait) with this new Punnett square (two traits), and answer the questions,

A. How did you need to change the punnet square to consider two traits?

Since we consider two traits, we need to add rows and columns according to the possible gametes. The new punnett square must have four columns and four rows (2ⁿ = 2² = 4).

Remember that all the possible gametes depend on the number of possible allelic combinations.

B. How would you need to change the punnet square if you were to consider three traits?

If we consider three traits, we need to construct a Punnett square with eight columns and eight rows (2ⁿ = 2³ = 8).

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Answer:

Agulhas Current

Explanation:

The Agulhas Current transports warm water from the Indian Ocean southwards along the South African coast.

Answer:

Agulhas Current

Explanation:

Other persons explanation

Answer:

Please dont delete

Explanation:

Hello. I am sorry that I can not answer your question but I am doing this so I can get answers of my own. I appreciate your understanding and I hope you get your answer soon. Good luck!

Answer:

B. Respire

hope it helps ... 【◆◆】

Mendel's tests on the pea plant are still relevant today since they demonstrate how traits are passed down through generations, hence option D is correct.

The pea experiment is frequently used in classrooms because peas have distinguishable qualities and it is relatively straightforward to analyze how these traits are inherited.

When a person possesses a dominant characteristic and is heterozygous for that trait, the descendants of that person might also possess a recessive trait.

Therefore, It helps show the transmission of traits from parents to offspring.

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Answer:

Answer!

Explanation:

Okay so, genes come in different varieties; which are called allele. somatic cells contain two alleles for every gene, with one allele provided by each parent of an organism. BUT, an allele that is hidden, or not expressed by an organism, can still be passed on to that organism's offspring and expressed in a later generation.

During meiosis I, chromosomal pairs randomly align along the metaphase plate. Each chromosome pair member carries one allele for each gene. Every gene combination shows up in the offspring.

Chance determines which of the 23 homologous pairs of both parents' chromosomes are inherited. The possible combinations of 23 chromosomal pairs total 8,324,608. As a result, the chromosomal combinations of two gametes are almost never identical.

Actually, each parent has two distinct gene pools. Additionally, only half of each parent's DNA is passed on to their offspring. and that the randomness of the portion that is passed down. All of these factors work together to guarantee that every child has a distinct collection of genes.

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Answer:

your body is made up of cells a) aubacteria b) eukaryotes c) ptokaryotes d) Archeobacteria

Explanation:

because the biggest cell in your body is the brain so it needs all the brain cells in your mind to make the brain makes sense

What are Air Masses:  They large volumes of air that have generally the same temperature and pressure.

How they work: One is heated by an electrical current, the other is not. As air flows across the heated wire, it cools down.

Example of an Air Mass: The air masses in and around North America include the continental arctic, maritime polar, maritime tropical, continental tropical, and continental polar air masses. Air is not the same everywhere.

Fact: Unstable air masses have different temperatures and pressures.

How they are formed: An air mass forms whenever the atmosphere remains in contact with a large, relatively uniform land or sea surface for a time sufficiently long to acquire the temperature and moisture properties of that surface.

*** The Earth's major air masses originate in polar or subtropical latitudes.

Therefore, a half-life of 2000 years saying that 100 grams will decompose to 50 grams in 2000 years. That 50 g will decompose to the requested 25 grams in another 2000 years. 2,000 + 2,000 = 4,000 years are required.

Elements are substances that cannot further breakdown as a result of any chemical reaction. There are a certain number of protons in each element's atom.

Since they make the organic compounds that are present in all living things, chemical elements are crucial to living things. Carbon is the primary element in all organic compounds, including lipids, nucleic acids, proteins, and carbohydrates.

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Answer:

35% is the probability that the woman is a carrier of the deafness allele

Explanation:

Both man and woman have normal hearing

Woman's father has autosomal dominant sensory-neural deafness - Dd

Genotype of heterozygous Woman's father = Dd

Let us assume that woman’s mother has normal hearing = dd

Dd * dd

Dd, Dd, dd, dd

Two deaf and two normal offspring.  

Since the penetration is of 70%, the probability of woman being a carrier is  

½ * 70% = 0.35

Answer:

1. A forest of pine trees is burned over a 10 mile area when lightning strikes a tree. In the spring, a few seedlings are beginning to sprout → secondary succession.

2. A glacier has scraped all soil from a rocky area. As it slowly retreats, some of the rock is broken down by weathering. Some moss begins to grow → primary succession.

3. A small symbiotic organism secretes acid into the rock to anchor itself in place → lichens - pioneer organisms.

Explanation:

The succession is the colonization of an open area and includes all the changes the area suffers since then. It is a sequence of events that involves the establishment of different species through time. A sequence of changes that occur in a community temporally and spatially. Local colonizations and extinctions occur while ecosystems evolve at a more complex level.

Ecological succession occurs in stages. The first stages are represented by communities of simple trophic levels and few species. With time, the communities go through different stages.  They transform into more complex ecosystems that are much richer in diversity, showing more interaction among the different species that compose it. The final stage is known as the climax and represents a mature and stable system.

While the community is going through these changes, many species get extinct while many others get to emerge and survive. It occurs overlapping of different taxonomic groups that interact with each other competing or beneficiating other groups.

There are two types of succession, primary and secondary, depending on the magnitude of the alteration.

In those cases where there is an alteration or disturbance at a site that opens the area, it allows new species to grow. With time, new species arrive and manage to establish again. The order of the establishment depends on the strategies of each of the species to survive.  

First, pioneer species arrive. These are the first inhabitants, mostly lichens or plants with the capability of surviving in such an environment. Only a few pioneers can establish in the open space. Pioneers modify the habitat, making it more suitable for the establishment of later species, converting rock into fertile soil. As conditions get better, new species arrive like grasses. Grasses and pioneers keep modifying the soil,  making it better with time. New species arrive. Habitat modification keeps on going while new species establish. They produce shadows, alter the temperature, and humidity, fertilizing the soil, competing for resources. Competition becomes more frequent between species. The first species are eventually eliminated by competition, but new species keep appearing and competing for resources. This sequence continues until the commuting reaches a climax, becoming stable and lasting for hundreds of years until another disturbance occurs.