Fact 1: Heterotrophs get food by eating other living things. Fact 2: Animals are heterotrophs, or other-feeders. Given the two facts above, what do animals use as a food course?
Possible answers:
[i] it keeps an organism warm.
[ii] water.
[iii] Generating heat.
[iv] Organic compounds.
[v] deadwood.
[vi] light energy.
[vii] other living things.
[viii] inorganic.
[vii]