Is currents shape rivers over long periods of time true or false?

yes

Explanation:

currents of rivers do shape it. it erodes at the sides making it wider and different shapes.

•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:

blue

light-years

magnitude