Given a scientific question, generate a correct answer to it.

[EX Q]: What is the layer above the mesophere called?
[EX A]: stratosphere

[EX Q]: How do glucose, ions, and other larger molecules leave the blood?
[EX A]: through intercellular clefts

[EX Q]: Cycling, shoveling snow and cross-country skiing are examples of what kind of heart-strengthening activity?
[EX A]:
aerobic