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?
OpenStudy (anonymous):
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):
@PRAETORIAN.10 @BioEpic
OpenStudy (bioepic):
The longer-spined sea urchins existed before the shorter-spined sea urchins. As you go deeped down a rock layer, you go 'farther back in time'. Therefore, the fossil on the bottom is the older one.
OpenStudy (bioepic):
@laurisve got it? Medal pls!
OpenStudy (anonymous):
thank you
OpenStudy (bioepic):
No problem!
OpenStudy (praetorian.10):
sorry still at uni :/ my bad
OpenStudy (bioepic):
np
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