You are presented with the quiz "Ethologists usually study how animals do what in an ecosystem?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "ethologists usually study how animals behave in their natural environment" and "students take a field trip to an ecosystem to observe the homes of animals in natural habitats". 

So, what's the best answer to the question?


 

      behave in their homes     