Answer:
B is oldest because it is at the bottom which entails that it is the oldest.
Explanation:
The answer would be respiratory because that system is used to breath oxygen and exhale carbon
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<span>The correct answer is Some plant and animals are restricted to a particular habitat. That means that they would not be able to live in other habitats either because of natural predators that would eliminate them or because they would ruin the ecological system if they were to interfere with the natural order of things. Things like climate might also affect this.</span>
