C. Vestigial.
A vestigial structure example in out bodies is the Appendix. We don't really need it, it just kind of "hangs out" in our bodies. We evolved to not need it.
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The layer above it could have been a covering of mud or plant matter. This would be the layer that helps make fossils it wouldn’t necessarily have fossils in it.
Answer: Commensalism
Explanation:
Commensalism is a type of symbiotic relationship between two organisms where one of the organisms benefits greatly from the symbiosis relationship. The other organism is not helped but is not harmed also from the relationship. It is a one-sided symbiotic relationship.
Examples of this kind of relationship is between the cattle egrets and a cattle. The
While the cattle is grazzing it stir up insects, the cattle egrets eat the insects. The presence of cattle egrets do not harm or help the cattle, while the cattle egrets gain food.
