All organisms need a
of
to survive.

All eukaryotic cells contain small bodies called

What substance acts to prevent sudden ph changes in bodily fluids?

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.