The wood sample is 17190 years since the carbon-14 isotope has undergone 3 half-lives.
What is the halflife of a radioactive element?The Half-Life of a radioactive element is the time taken taken for half the atoms present in the nucleus of that element to disintegrate.
The half life of carbon-14 is 5730 years.
Initial amount of carbon-14 in the wood sample = one million (1,000,000) atoms.
Now it only has 125,000 C 14 atoms.
Number of half-lives undergone = 3 half-lives
Age of the wood sample = 3 × 5730 = 17190 years
Therefore, the wood sample is 17190 years old.
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Can I please get help?
Select all of the following organs that are also part of the excretory system.
Answer:
The Urinary bladder, the ureter, and the urethra are all organs that belong in the execratory system.
The heart and spinal chord are not organs in the execratory system. The spinal chord belongs to the nervous system and the heart belongs to the circulatory.
What does the homunculus model demonstrate about our bodies?
Answer:the homunculus or, somatic sensory homunculus, is the portion of the sensory cortex which maps and represents our sensory nerves throughout your body
Explanation: Large portions represent our hands, mouth, and tongue. Smaller representation is given to our pinky toe and backside of our knee.
14. Choose the best answer. How are carbohydrates and lipids different?
Answer:
1. All lipids are insoluble in water
Explanation:
Lipids are nonpolar so it does not mix with water and is insoluble. Unlike Carbohydrates that are polar and hydrophilic.
pls help me quick because I have no idea
Answer:
I don't know just trying to learn to read
Where is the greatest concentration of cones located?.
The greatest concentration of the cones are located at the fovea which is the center of the macula.
What do you mean by Cones cells?Cones cells may be defined as the receptors in the retina responsible for your understanding of sight.
The fovea which is the center of the macula also known as the yellow spot has the highest concentration of the cones. This is because the image formed here is very clear and distinct as cones and rod cells are known for the sense of sight.
Therefore, the greatest concentration of the cones are located at the fovea which is the center of the macula.
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In which of the structures does reabsorption of organic substrates occur?.
When are germ line cells set aside from somatic cells?.
Explain why most organisms that have lived on Earth do not form fossils
BRAINILEST PLEASE HELP!!
What are some ethical concerns with whole genome sequencing?
Select all that apply.
your genome could be sequenced without your knowledge or consent
genomes may reveal information about mental illnesses
people could make money off the genome sequences of others
treatments for diseases will need to be personalized
Answer:
They identify three major ethical considerations that have been implicated in whole-genome research: the return of research results to participants; the obligations, if any, that are owed to participants' relatives; and the future use of samples and data taken for whole-genome sequencing.
Explanation:
Answer:
-Your genome could be sequenced without your knowledge or consent
- Genomes may reveal information about mental illnesses
- People could make money off the genome sequences of others
Explanation:
I just took the final.
Nathan has an overinflated and unjustified sense of self-importance. He is preoccupied with fantasies of success and believes that he is entitled to special treatment from others. Nathan appears to suffer from ________ personality disorder.
Nathan appears to suffer from narcissistic personality disorder in this type of scenario.
What is Narcissistic personality disorder?This is common in men and is characterized by disregard of other people's feelings.
This also involves overinflated and unjustified sense of self-importance which brings about entitlement to special treatment from others.
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Fatty acids that are missing hydrogen atoms are described as:.
Fatty acids that are missing hydrogen atoms are described as trans fatty acids.
Which factor, Heart rate or stroke volume, changes more in response to graded exercise?
Answer:Heart rate
Explanation: The cardiac output is the amount of blood pumped by the heart per minute.
Answer:
Heart rate changes more in response to graded exercise
True or false: When it comes to parasitic organisms, smaller parasites most often live in or on a larger host organism to survive.
Answer:
True
Explanation:
The answer is True. The parasite would obviously choose a larger host.
An abnormal, benign enlargement of the thyroid gland is called.
can someone help me please
Answer: im pretty sure its A
Explanation:
Which part of the brain filters sensory information and forwards only a fraction of it to the cerebral cortex?.
Answer:
Thalamus
Explanation: hope this helps
Why is it important to know a person's rhesus factor before a blood transfusion? a patient who is rh can receive only rh– blood. a patient who is rh– can receive only rh blood. a patient who is rh can receive only rh blood. a patient who is rh– can receive only rh– blood.
Answer:
a patient who is rh- can recieve only rh- blood
A patient who is Rh- can receive only have Rh- blood.
What is Rh+ and Rh-?RBCs are classified as Rh positive or Rh negative depending on whether the Rh antigen is present. A person whose RBCs have Rh antigen is known as Rh+ while one whose RBCs do not have Rh antigen is known as Rh- individual.Why is it important to know about Rh factor before blood transfusion?Knowing a person's Rh factor is crucial for ensuring that they receive compatible blood.
What happens when Rh- person receives Rh+ blood?An Rh- person becomes iso immunized, or begins to produce antibodies against the Rh + antigens, if they receive Rh+ blood during transfusion.
What individual can receive what blood?Someone with Rh+ blood can receive both Rh+ and Rh- transfusions, but those with Rh- can only receive Rh- blood.
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hello guys if you are seeing this i would love if you stopped by abs helped me cuz i really need the help you guys i appreciate for the ppl who stopped by
Answer:
animals are part of the lithosphere , air is part of atmosphere, fungi is part of biosphere, ocean water is part of hydrosphere, limestone is part of geosphere
Explanation:
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When the conditions become too harsh for its survival, a bacterium forms a/an _______________ and goes dormant
Answer:
endospore is the awnser
Explanation:
1. Single-celled organisms
a. were the first life forms on the planet.
b. became extinct soon after more complex organisms evolved.
c. can't exist on Earth unless they are parts of large groups.
d. All of the above
(WILL MARK BRAINLEST)
Answer:
A is the correct answer
Explanation:
the existed about 3.8to 4.0 billion years ago
Plant cells have a rigid cell wall, while animals do not. Which of the following explains why animal and plant cells are different in this way?
A. Animal cells are too small to have a cell wall.
B. Plants use the rigid cell wall primarily to restrict unnatural substances from entering their cells.
C. Plant cells require the cell wall in order to retain their shape.
D. Animals do not need to restrict substances from entering their cells.
What do fuel cells, batteries, and solar cells have in common?.
Answer:
They are sources of direct current.
Explanation:
Pls answer quick. If u don't know leave it
A category of personality tests in which individuals answer a series of questions about personal behavior is called a _________. a. rorschach test b. thematic apperception test c. self-report inventory d. projective test please select the best answer from the choices provided a b c d
A category of personality tests in which individuals answer a series of questions about personal behavior is called a self-report inventory.
What do mean by Personality?
Personality may be defined as individual dissimilarities in characteristic patterns of thinking, feeling, and behaving.
Self-report inventory test is a test that consists of questions that are associated with the personal behavior of an individual such as their values, emotions, symptoms, behavior, interest, etc.
Therefore, a category of personality tests in which individuals answer a series of questions about personal behavior is called a self-report inventory.
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Answer:
c is the correct answer
Explanation:
Which best describes the role of sunlight in the process of photosynthesis?
A Light provides the energy to make sugars from smaller carbon compounds.
B Light provides the energy to break down sugars into smaller molecules.
C Light provides the energy to combine oxygen and hydrogen to generate water.
D Light provides the energy to build large carbohydrates from simple sugars.
Answer:
A
Explanation:
I believe the answer is A
Bacteria that have taken up the pglo plasmid and grown on lb/amp plates will fluoresce under uv light?.
Answer:
Yes, it will uv lights kills bacteria
Explanation:
Which connective tissue wrapping separates individual muscle fibers?.
Answer:
endomysium
Explanation:
The endomysium, a fine layer of connective tissue, wraps each muscle fiber and separates it from neighboring fibers.
Whats the color of a peach?
Answer: orange and pink and yellow
Define a "holistic" approach to prevention. describe what might be an effective holistic method, and what types of organizations may be involved in spreading the message
A holistic approach means to provide support to their mental health needs as well as to their physical, emotional, social and spiritual wellbeing.
Why holistic approach is important?A holistic approach to health is essential to address the main cause of the problem. It encourages people to take care of their health and well-being. It is also essential to prevent illnesses.
So we can conclude that holistic approach is of high importance in the field of health.
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which allele is the dominant allele?
The dominant allele in accordance to the image displayed above is the allele for tallness (T).
What is allele?Allele is one member of a pair of gene. The allele of a gene comes in pairs.
According to this question, the height of gene is involved with two alleles as follows:
T - allele for tallnesst - allele for shortnessThe dominant allele is an allele that expresses itself over another allele in the gene. The tall allele expresses itself in the image displayed, hence, is said to be the dominant allele.
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