How energy is transferred from one organism to another?

Question

How energy is transferred from one organism to another?

Answer 1

A steer eats grass, I eat the steer.  Energy is passed from the grass to the steer to me.

Answer 2

Its passed up the food chain

it is stored in the chemical bonds of the compounds which make up plant/animal matter

when it is "burnt" that energy is released.

Answer 3

carbon molecules.  They burn. (are "metabolized")

That's even how oil burns, the carbon that was created by photosynthesis in plants.