Biology, 03.02.2020 00:04, tearaj

Short-spined sea urchin fossils were found directly above long spined sea urchin fossils in a layer of rock. what do the differences between the two sets of sea urchin fossils suggest about them?
a)the longer spines developed as the shorter-spined sea urchins grew older.

b)the longer-spined sea urchins existed before the shorter-spined sea urchins.

c)the shorter-spined sea urchins stretched their spines to ward off predators.

d)the shorter spines did not protect the sea urchins well enough and they died off.

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Short-spined sea urchin fossils were found directly above long spined sea urchin fossils in a layer...