I need get a , a on this or I’m failing lol please help

I think the answer is B, Rivers. Mountain ranges don't really help the environment much as can mostly only change the climate.

C

Explanation:

Plains are big fields of grass that need lots of water, air and sun to be alive, if there are plains on the planet, that means there is sufficient water and sun and air for a living organism to thrive such as plains.

•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:

your body is trying to warm itself up. or more precisely, sensors in your skin send messages to your brain to generate heat to your body.