SAT, 14.03.2020 21:53 triston12192000

Layer A is the bottom layer with images of a trilobyte and a fan shaped shell. Layer B is above layer A with images of a fan shaped shell and a cone shaped shell. Layer C is above layer B with images of a fan shaped shell and a spiral shaped shell. Layer D is the top layer with an image of a cone shaped shell.
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Ethan determines that layer B is 3.5 million years old. Due to the , he can estimate that layer A is years old.

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Layer A is the bottom layer with images of a trilobyte and a fan shaped shell. Layer B is above laye...