It's ADAPTIVE RADIATION because it is <span>the diversification of a group of organisms into forms filling different ecological niches.</span>
Salutations!
<span>Cells that perform similar functions combine to form: ----
</span><span>Cells that perform similar functions combine to form: tissues. A group of tissues working together combine to form an organ system. Organs working together combine to form an organ system. Organ system performing their functions makes an organism.
Thus, your answer is option D.
Hope I helped (:
Have a great day!</span>
Food chain is the answer.
Survival of the fittest. If one organism thrives better in an enviornment and the other organism struggles, the one that is more adapted will obviously play a part in helping the less adapted organism die out. Food is a major point along with other aspects