What is the main function of villi? A. They move food from the stomach to the small intestine.

2.they absorb nutrients into the bloodstream.

3. They absorb water from chyme

4. They move food from the small intestine to the large intestine.

Which of these describes how heat is transferred by convection* a. sunlight travels through space without the aid of fluids or solids. b. warm air rises and takes the heat with it, eventually, it cools and sinks c. air at the equator rises and sinks at the poles. d. air molecules touch the warm ground, heating them up *not conduction