What determines how much energy a human can receive from food? o
A. How much the food molecules weigh
B. How much energy the food molecules have
ОО
C. How much nitrogen the food contains
O
D. How much oxygen the food contains

The skeletal system performs a variety of functions that are crucial to maintaining life processes. what function is performed in the bone marrow, but not in the ossified bones of the skeleton? a oxygen transportation c mineral storage b. muscle attachment d red blood cell production

How can you tell the difference between rough er from smooth er?

Which statement is the best summary of the model? a-a series of aerobic and anaerobic reactions take place in cells b- the sun's energy moves through trophic levels in a food chain c-light energy is converted into stored chemical energy plants. d- food molecules are broken down in the cells if living things.