Answer:
Reinforcement is the process by which natural selection increases reproductive isolation. Reinforcement can occur as follows: When two populations which have been kept apart, come back into contact, the reproductive isolation between them might be complete or incomplete. If it is complete, speciation has occurred.
Explanation:
<3
I think it is the somatic nervous system.
Answer: A cactus has needles to prevent animals from eating the water out from it.
Explanation:
The answer is heart attack, it is a naturally occurring cause of death
They all take nutrients out of the soil which leaves the soil infertile
