Answer:
Stimulus is the cause or change in an organism's surroundings that causes it to response .. response is the result of the stimulus on the organism.
Explanation:
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The nucleus. If a cell has a nucleus it is eukaryotic if it doesn't, it is prokaryotic.
The answer to your question is solar radiation hitting the earth, a sphere which is tilted on its axis, puts into effect differential heating of the earth's surface. This affects weather and climate all across the globe. For example, the tropics along the equator get a lot more heat than at the poles. The air at the equator is heated.
1) biological evolution
if the genes changes keeps increasing means its going through evolution
