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Finger [1]
3 years ago
8

Based on the timeline, about how many years ago could the oldest mammalian organism have lived?

Biology
2 answers:
diamong [38]3 years ago
8 0
200 millons years.
Hope this helps!
WINSTONCH [101]3 years ago
7 0

The correct answer is option B, 200 million years ago

The mammals first evolved some 200 million years ago as dinosaurs on the planet Earth. This can be estimated through radiometric dating. There was transition from reptiles to mammal which led to the emergence of mammal like reptiles known as stem mammal or proto mammals. The mammals have basically evolved from the group of reptiles knows as Synapsids

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Paul had chicken pox when he was 5 years old. nicholas received the chicken pox vaccines. which type of immunity does each man h
GrogVix [38]

Answer:

Paul has natural active immunity, while Nicholas has artificial active immunity.

Explanation:

Natural active immunity is an immunity that occurs when an individual is exposed to a disease causing organism, gets infected, and also become immune to the disease due to the primary immune response. From the question, Paul has natural active immunity because he had chicken pox before, and the virus that causes chicken pox has interacted with his immune response, hence, making him to develop natural immunity to the disease.

Artificial active immunity is an immunity that an individual acquires when small amount of immunity to a disease is deliberately exposed to his body. Artificial active immunity is usually produced in the form of vaccinations. From the question, Nicholas has artificial active immunity because chicken pox vaccines were intentionally introduced to his body.

8 0
3 years ago
You want to determine if a new diet medication will help rats to lose weight. What is the dependent variable? * the rats weight
slava [35]

Answer:

the rats weight loss

Explanation:

<em>The dependent variable would the weight of the rats.</em>

<u>The dependent variable is the variable whose value is dependent on another variable during an experiment. It is the actual variable set out to be measured or tested by researchers. The effect of the manipulation of the independent variable is measured on the dependent variable.</u>

Hence, in an experiment aimed at determining whether a new diet medication will help rats to lose weight, the weight loss by the rats would be the dependent variable.

3 0
3 years ago
Why is the sun considered the ultimate source of energy for life on earth?
Svetach [21]
<span>b. photosynthetic organisms provide energy for other organisms on earth.

B is the most suitable answer as photosynthetic organisms get their energy from the sun, and other organisms get their energy from photosynthetic organisms, so the sun is the source of energy for all life.</span>
5 0
3 years ago
Read 2 more answers
Compare the strengths of covalent, ionic, and hydrogen bonds
mariarad [96]

Answer:

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Explanation:

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3 years ago
The author suggests inertia is most often experienced
saul85 [17]

Answer:

I think A when planets orbit

4 0
3 years ago
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