Water flow improves in the aftermath of a forest fire because rain always puts out fires.
no living organisms survive fires, decreasing demand.
they clear the land, allowing more water to flow over it.
much of the water in a local watershed will be used to fight the fire.

•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:

he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?