Natality refers to.

The tiger census in our national parks is often based on . . . . . . .

In the given diagram,identify $a, b, c,$ and $d$. Specifically,identify $b$ and $c$.

What is the scientific study of human population called?

Read the following statements and choose the option with all the correct statements only :
$(A)$ The size of a population for any species is not a static parameter.
$(B)$ Total number is always the most appropriate measure of population density because in all cases it is most meaningful and easy to determine.
$(C)$ $A$ population growing in a habitat with unlimited resources shows initially a lag phase followed by phases of acceleration and deceleration and finally an asymptote.
$(D)$ According to ecologists,life history traits of organisms have evolved in relation to the constraints imposed by the abiotic and biotic components of the habitat in which they live.
Choose the correct answer from the options given below :

Which environmental conditions are available for organisms that produce a large number of offspring at once versus those that produce only one offspring,considering their life history traits and the constraints imposed by biotic and abiotic factors?