QUESTION 45 Some organisms are called regulators because
a. they have a zone of stability where homeostasis is maintained
b. they control other organisms in their environment.
c. their nerve cells regulate energy release
d. they have no control mechanisms that keep the internal environment relatively constant.

a. they have a zone of stability where homeostasis is maintained

Explanation:

Regulatory bodies are those that manage to keep the inside of your body balanced, even with drastic changes in the outside of your body. In other words, we can say that these organisms have a zone of stability where homeostasis is maintained, leaving the internal environment constant, independent of the external environment. The advantage that these organisms have is that they can establish themselves in different ecological niches, the disadvantage is that this regulation has a large energy expenditure.