1.All species are capable of producing offspring at a faster rate than food supplies increase. So, there is a tendency towards overproduction.
2.There is biological variation within all species.
- 3.Since in each generation, more individuals can be produced than can survive, and because of limited resources, there is
- competition (not necessarily the same thing as fighting, however) among individuals.
- 4.Individuals possessing favorable variations or traits (i.e. speed, resistance to disease, protective coloration) have an advantage
- over those who do not. In other words, have greater fitness because favorable traits
- increase the likelihood of survival and reproduction.
5.The environmental context determines whether or not a trait is beneficial. Hence, favorable traits become most advantageous are the results of a natural process.
- 6.Traits are inherited and passed on to the next
- generation. Individuals who produce more offspring are said to have a greater reproductive success, or fitness.
7.Variations accumulate over long periods of time, so later generations may be distinct from ancestral ones.
8.As populations respond to pressures over time, they may become distinct species, descended from a common ancestor.