Homeostasis may be studied directly by: identifying the genome of a given population of humans. observing differences in such measures as body temperature across human groups. experimentally manipulating or replicating environmental conditions and observing human responses. observing living populations as they engage in various activities in various settings.

Correct answer: C). Experimentally manipulating or replicating environmental conditions and observing human responses

Homeostasis is the process in which the organ system of our body works to maintain a stable external environment irrespective of change of changes in the external environment.

It is very important for the body to maintain a constant stable environment a sit is necessary for the normal functioning of the cell. The main mechanism for homeostasis is the body temperature, blood sugar, blood pressure, body fluid composition, and gas concentration.

Hence, the correct answer would be option C.