random chance.
found how to get product for growt hair
Food supply
There must be genetic variation in the population
The system must not be in hardy-weinberg equilibrium.
resources must be limited in the ecosystem
When there is low gene flow
When there is no selective pressure
When there is a bottleneck
genus
A structure that is a member of another structure is a structure within a structure.
example: a grizzl bear thats from ot, dry weather and the people moved it to the rain forest its adaption would be learing how to get use to the cold or the rain. :)
Each individual in a population behaves in a slightly different manner.
Organisms are born with them