The differential reproduction and survival of individuals because of the differences in phenotype is known as natural selection. It is a major mechanism of evolution.
The two key ingredients to natural selection are reproduction and variation.
Genetic variation refers to the populations, individuals, and biological systems which are different over space.
The biological process through which new individual offspring or organism is produced from their parents is known as reproduction.
Predation is a kind of biological interaction of two organisms, where a predator kills and eats a prey.