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mestny [16]
3 years ago
5

Short-spined sea urchin fossils were found directly above long-spined sea urchin fossils in a layer of rock. What do the differe

nces 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.
Biology
2 answers:
Eddi Din [679]3 years ago
4 0

Answer:

The longer-spined sea urchins existed before the shorter-spined sea urchins

Explanation:

The lower buried is what died off first and the recently buried is the newly evolved version.

Alex3 years ago
4 0

Answer:

mic up? vain#7200

Explanation:

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