Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Input: Consider Input: Reptiles are described by the term ectothermic, which means their internal temperature depends on the temperature of their environment.

Output: Reptiles are described by what term that means their internal temperature depends on the temperature of their environment?

Input: Consider Input: Interconnected pathways through which carbon is recycled through the biotic and abiotic components of biosphere.

Output: Interconnected pathways through which carbon is recycled through the biotic and abiotic components of what?

Input: Consider Input: In their pure form, all elements have an oxidation number of zero.
Output: In their pure form, all elements have an oxidation number of what?