The answer is D. The rainforest is important to life as a whole on the planet.
This is true because 6 and 15’s sum is 21.
The best and most correct answer among the choices provided by your question is the third choice.
The oceanic trenches<span> are hemispheric-scale long but narrow topographic depressions of the sea floor. They are also the deepest parts of the </span>ocean<span> floor.</span>
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