The Sun warms the atmosphere and drives convection currents because A. warm air is less dense, so it rises

B. The warm air is cools and makes rain

C. the cooler land pushes away warm air

A. warm air is less dense, so it rises.

Explanation:

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he is very short, and he can only reach halfway up on the elevator buttons. but on a rainy day, he has his umbrella with him, and he uses it to poke the button at the top.

the correct answer is option b

behavioral response need communication and thus co-ordination at several levels such as interaction among cells, organ system and the entire organism.

behavioral response produces both internal and environmental stimulus.