In India,the human population is heavily weighed towards the younger age groups as a result of:

The tiger census in our national parks and tiger reserves is based on:

Read the following statements and select the correct option with respect to population attributes:
$(a)$ Population density is necessarily measured in numbers.
$(b)$ Tiger census is often based on pug marks and fecal pellets.
$(c)$ Biomass is not a meaningful measure to know population size.
$(d)$ Size of a population for any species is not a static parameter.

Which of the following statements is true regarding individuals of the same species?

$A$ population is:

Given below is the age pyramid for Hungary. Which type of growth does it represent?