Population density can be define as the number of individuals of the population of a species living in a particular area over a concerned time. It is affected by the death, birth, immigration and migration of the members of the concerned population.
On the basis of the above description, this can be concluded that the ecologist is looking for the population density.
The hypothalamus is involved in different daily activities like eating or drinking, in the control of the body's temperature and energy maintenance, and in the process of memorizing and in stress control. It also modulates the endocrine system through its connections with the pituitary gland.
