<span>ileocecal valve or sphincter</span>
<em>both producers and consumers are the part of ecosystem but finally either directly or indirectly they become food of the decomposers that may be micro-organisms or the larger parasite or saprophyte ..
organisms taking food from living host are parasite while taking food from dead matter are saprophytes..</em>
Answer:
The answer is D) experiment
Explanation:
the only answer on here that changes multiple times is an experiment.
A species must be able capable of surviving and reproducing despite changes to food sources, climate, or threats from predators.
