Answer:
d. feedback mechanism "
Step-by-step explanation:
Feedback mechanism: The term feedback mechanism is defined as a loop system that responds towards a perturbation. It can be observed at the level of ecosystems, cells, biosphere, or organisms and is responsible for regulating homeostasis or to gain a particular level of optimal condition.
It is the mechanism related to hormonal or nervous control and therefore regulates these in human beings.
Type: Positive and negative feedback mechanisms.
In the question above, the statement signifies the importance of the feedback mechanism.