How does energy move through living systems?

A. Energy can be created by organisms and can be passed on if it is not used by that organism

B. All of the energy is used up by organisms as they move, grow and reproduce so less energy is available for the next organism in the food chain

C. Energy is transformed and/or lost as heat as it passes from one organism to the next, but the total amount always stays the same

D. Energy is created during photosynthesis