In this task, you are given a fact statement and question based on the fact. Your task is to generate the correct answer for the question. The answer needs to be generated using the context fact statement.

Fact: carnivores only eat animals. Question: Carnivores' only source of what comes from other animals?
sustenance

Fact: contact between rocks over long periods of time causes rocks to smooth. Question: A rock tumbler revolves to?
smooth gemstones

Fact: the shape of body parts is an inherited characteristic. Question: An inherited characteristic from my dad is?

moles