Answer:
D
Explanation:
Larger organism increases more in volume than area. That's why larger organism uses respiratory systems or organs and systems instead of simple diffusion for removal of waste and absorption of nutrients.
Answer: Predators (trust me)
Asexual organisms produce clones of themselves. That leaves the organism prone to being wiped out in its entirety, because every individual is equally in trouble when danger strikes. A virus or predator that affects one affects them all. It has no possibility of exploring new places, new foods, new methods of escape.
Souce: https://www.quora.com/Why-dont-all-organisms-reproduce-asexually
The distribuition of alleles changes due to random chance.