Please help with biology questions.

Only 10 percent of the energy stored in an organism can be passed on to the next trophic level. Of the remaining energy, some is used for the organisms life processes, and the rest is _______.

A. Used in representing

B. Stored as body tissue

C. Stored as fat

D. Eliminated as heat
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Sea otters live in the ocean. Which of the following is not likely to be limiting factor on the other sea otter population?

A. Disease

B. Competition

C. Drought

D. Predation