instruction:
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.
question:
Question: If Milo starts rubbing two surfaces together quickly and then decrease the speed, what happens to the amount of energy produced? 
 Answer: decreases
answer:
Friction causes the molecules on rubbing surfaces to move faster, so they have more energy. This gives them a higher temperature, and they feel warmer.


question:
Question: Gerald laid down many rock layers. The layers on the bottom level were likely laid 
 Answer: first
answer:
Lower rock layers were laid down earlier, so they are assumed to contain older fossils.


question:
Question: Sandra was scared and her adrenal glands secreted less adrenaline after her fight or flight response, which caused her heart rate to 
 Answer: decrease?
answer:

This causes the delivery of less oxygen to the cells, and this stimulates the heart rate via adrenalin, so that pulse rate increases in an effort to deliver enough oxygen to cells.