It decreases the rate of some chemical reaction that help the body in various ways,example is the hydrochloric acid that helps in the breaking down of proteins ,so when you have fever ,it reduces the activeness of the chemical,that's why u always feel to throw out when you have fever
I think the answer is B. But don’t trust my answer.
Answer: Ecosystem
Explanation: An ecosystem consists of all the biotic and abiotic factors in an area and their interactions. A niche refers to the role of a species in its ecosystem. A habitat is the physical environment in which a species lives and to which it is adapted.