O the erosion of land over millions of years by the
swift-moving water of a river.
O
tectonic plates causing the uplift of land.
O
wind storms blowing away large chunks of land
over millions of years.
O
the chemical weathering of land from acidic
rainfall.

•there must be variation for the particular trait within a population.

•the variation must be inheritable (that is, it must be capable of being passed on from the parents to their offspring).

•individuals with one version of the trait must produce more offspring than those with a different version of the trait.good

explanation:

within 30 of the equator hope this