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

A?

Answer 2

@YoursTruly

Answer 3

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

Answer 4

tyyyy