A Layer of Sediment Composed of Tiny Shell Fragments and Dead

A layer of sediment composed of tiny shell fragments and dead plankton that gets thicker as it moves away from mid-ocean ridges and covers most of the ocean floor,but is too thin to have been accumulating since the formation of Earth,suggests that _____________.

A) plankton and shelled organisms evolved recently
B) plankton and shelled organisms do not often die and sink to the bottom of the ocean
C) the ocean floor is younger toward the mid-ocean ridge
D) All of the above are correct.

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