The physiological capacity of a population to produce offspring is known as:

Which of the following is $NOT$ a primary factor affecting population density?

$A$ biologist studied a rat population at the time of birth. He observed that the estimated births were $250$, estimated deaths were $240$, $20$ rats immigrated into the population, and $30$ rats emigrated from the population. What was the net increase in the population?

Which factors affect the population size in a specific habitat?

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

The average population density on Earth is approximately: