Answer the following question: Fact 1: Ethologists usually study how animals behave in their natural environment. Fact 2: Animals behave according to instinct. Given the two facts above, ethologists study how animals use what in their natural environment?

Options are:
*Energy.
*Chlorophyll.
*fur.
*digestion.
*instincts.
*lungs.
*an object.
*Energy..
Answer:
instincts