1.Inheritance: the change of the inherited traits of a population of organisms through successive generations. 2. Overproduction: each generation has more offspring than can be supported by the environment.3. Survival of the fittest: the continued existence of organisms which are best adapted to their environment. 4.Differential Reproduction: organisms best adapted to a given environment will be most likely to survive to reproductive age and have offspring of their own.
Survival of the fittest
The variations that exist in the population is green and red bugs and also a bird.
The bird only likes the taste of red bugs, so there are a lot more green bugs then red bugs. The green will produce to make more green bugs and then there will be no red bugs left.