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. Given these facts, ethologists usually study how animals do what in an ecosystem among the following options:
- raising their temperature
 - retaining heat
 - reducing acid rain
 - protect plants
 - share properties
 - behave in their homes
 - storing water
 - Generating heat


 

      behave in their homes   