I think A is the youngest layer, because of the new sediments that fell upon the animal.
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I got quite Of bit of answers out of this
Biomechanical mechanisms, habitat for plants and animals, participates in cycling of all materials used by living things.
It sounds like you may be looking for Peridotite, which is a type of ultramafic igneous rock that contain olivine as their main mineral in combination with <span>pyroxenes and amphiboles. I hope this helps! </span>
