There must be genetic variation, the variation must be heritable, and there must be differential reproduction (due to competition).
Natural selection requires variation within a population.
only physically different.
1. different breeding 2. evolution 3.adaptation
If there is not reproductive fitness conveyed by a variant trait, then natural selection has nothing to select and nothing to promote into the populational gene pool.
What population? Perhaps you mean if there were no variation for natural selection to select from.
There are really no steps in natural selection - just conditions required for it to occur.
Without genetic diversity, natural selection cannot occur
genetic drift, mutation, natural selection, and migration
differences in the characteristics of individual trees
the unequal ability of individuals to survive and reproduce
by having sexual intercourse with hoes and getting money
1. different breeding 2. evolution 3.adaptation
Evolution through natural selection occurs slowly over millions of years. It has been hypothesized that evolution is the result of positive mutations that occur in a community of organisms that help them survive better. Evolution is essentially descent with modification.
Because it was Darwin who made it a scientifically plausible explanation, by providing a mechanism by which evolution could occur....Natural Selection.
If there is not reproductive fitness conveyed by a variant trait, then natural selection has nothing to select and nothing to promote into the populational gene pool.
Evolution occurs through natural selection via survival of the fittest. This means that those organisms that are most well adapted to the environment will survive and pass on their genes.
Yes, that is what Darwin thought. However this has never been shown to be true.
By selecting the variant organism most suited to the environment the alleles of the population then change in frequency over time and thus evolution occurs.
gene duplication (might give advantages)