The population of any species is:

Choose the wrong statement.

The effect of various factors on a population is reflected in its size,which can be expressed by .......

The process by which individuals are included into a population is known as

Consider the birth rate and death rate per year in a given population.
Total population after $5$ years $\rightarrow 100$
Number of individuals dying per year $\rightarrow 10$
Number of individuals born per year $\rightarrow 20$

In a pond,there were $500$ carp fishes at the beginning of the year. They have a birth rate of $4$ offspring per carp per year. What will be the total number of carp fish at the end of that year?