Answer: The correct answer is : Comparative biologists were based in North America, while ethologists were based in Europe.
Explanation: Comparative biologists formulate hypotheses and in some cases predictions from an existing body and then test them by means of experiments.
Ethologists study the behavior of animals in their natural environment. The etiology is a branch of zoology.
Answer:
In the 1900s, comparative biologist were based in North America, while ethologist were based in Europe.
Explanation:
