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Biology 19 Online
OpenStudy (anonymous):

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? The longer spines developed as the shorter-spined sea urchins grew older. The longer-spined sea urchins existed before the shorter-spined sea urchins. The shorter-spined sea urchins stretched their spines to ward off predators. The shorter spines did not protect the sea urchins well enough and they died off.

OpenStudy (anonymous):

@Gabebro13 @Compassionate

OpenStudy (anonymous):

B?

OpenStudy (anonymous):

@kennybm

OpenStudy (lacypennelll):

I do believe it is B, because the deeper the fossil the older it is.

OpenStudy (anonymous):

B .

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