What are given off as by-products of cellular respiration? a. carbon dioxide and water
b. energy
c. food
d. oxygen

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.

Which substance contains thylakoids? a) nadph b)atp c)stroma d)chloroplast

What do you call the long folded tube inside the body attached to the stomach where nutrients in the food are absorbed?