animals from the most heavily populated ocean environments tend not to be preserved as fossils because

It  tends not to lock out enough oxygen to preserve organic material well.

Explanation:

Because some environments are more amenable to fossil preservation, the fossil ... For mineral shells of many marine invertebrates, "fixation" may be as simple ... this medium tends not to lock out enough oxygen to preserve organic material well.

the sun's light combined with the visible wavelenghts form what is called ultraviolet radiation, which are the long waves at the end of a visible light sprectrum.

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bioteacher101