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Biology 6 Online
katherine:

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.

katherine:

A?

katherine:

@YoursTruly

YoursTruly:

B sounds more accurate. The further beneath the surface you find a fossil, the older the species is.

katherine:

tyyyy

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