Question

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.

Answer 1

@Gabebro13 @Compassionate

Answer 2

B?

Answer 3

@kennybm

Answer 4

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

Answer 5

B .