Sex ratio in a species indicates the numerical relation between the number of

Which of the following is not a part/component of population attributes?

The density of a population in a habitat per unit area is measured in different units. Write the unit of measurement against the following:
$(a)$ Bacteria $.......................$
$(b)$ Banyan $ .......................$
$(c)$ Deer $ .......................$
$(d)$ Fish $ ......................$

In a population where competition between individuals is severe,the distribution is said to be:

The study of human populations in a biological community is called...........

An organization formed by individuals of the same species is called.....