In this task, you are given a question and answer for that. The answer will fill in the blank or will complete the unfinished question. Your task is to provide an explanation based on the given question or fill-in-the-blank statement, and answer.

[Q]: Question: Jean is looking at a rock face that shows the layers of the Earth. Jean notes that the rocks towards the top of the exposed cliff have an age that is 
 Answer: lesser
[A]: Older layers are deeper in the Earth, younger layers are closer to the surface.


[Q]: Question: Someone that never works out will likely have _____ muscles than someone who lifts weights at home all day. 
 Answer: smaller
[A]: Aerobic exercise increases the size and strength of muscles in the heart and helps all your muscles develop greater endurance.


[Q]: Question: Karen is feeling very warm, and starts to sweat. Her blood flow is increased, likely because the day is 
 Answer: hot
[A]:
On a hot day, an endotherm may give off more heat by increasing blood flow to the surface of the body.