An elephant produces six young ones in its life span of $100$ years. If this continues,then,in $750$ years,$19$ million elephants will be produced. It is $NOT$ possible in reality mainly due to . . . . . . .

Give scientific reasons: Genetic drift is much more likely to change allele frequencies in a small population rather than a large population.

Which organisms survive in their environment?

Random genetic drift in a population probably results from

The frequency of traits increases when they are ........

Given below are two statements.
Statement $I$ - In disruptive natural selection,individuals acquire peripheral character value at both the ends of the distribution curve.
Statement $II$ - Industrial melanism is an example of disruptive selection.
In the light of the above statements,select the correct option given below: