A rabbit (primary consumer) is preyed upon and consumed by a fox (secondary consumer). Before being consumed, the rabbit ate leaves and berries containing 20 kJ of energy. How many kilojoules of the energy from the leaves and berries did the fox obtain from eating the rabbit?

Answer 1

Here is what I think.
If the rabbit had just eaten the berries and leaves then the fox obtain ALL of the 20 kJ of energy. If the rabbit ate the leaves, say an hour ago, then the rabbit used up some of the 20 kJ moving around and the fox obtained less than 20 kJ.