Question

drag the missing word into place
i thought the animal was a cat, but it was a whole different
.
regulation
species
supply

Explanation:

The sentence compares an animal initially thought to be a cat to another type of animal. "Species" refers to a group of living organisms, which fits the context of classifying animals. The other options ("regulation" meaning rule, "supply" meaning stock) are irrelevant to animal classification.

Answer:

species