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?
a)the longer spines developed as the shorter-spined sea urchins grew older.

b)the longer-spined sea urchins existed before the shorter-spined sea urchins.

c)the shorter-spined sea urchins stretched their spines to ward off predators.

d)the shorter spines did not protect the sea urchins well enough and they died off.

b) is correct.

Explanation:

As the animals die, they get covered in layers. The lowest being the oldest. The difference is showing us a direct link between the two fossils. This means that the longer-spined sea urchins existed before the shorter-spined sea urchins. And evolved to have shorter spines rather than long ones.

answer;

c. a tree whose roots are surrounded by wet sand.

explanation;

water stress is an important factor limiting the growth and productivity of forests.water stress is the most often cited cause of poor survival and growth of woody landscape plants.

-insufficient soil moisture is the most common form of water stress, but excess moisture that leads to poor soil aeration (hypoxia) can also result in reduced plant vitality. a tree whose roots are surrounded by wet sand would be least likely to experience water stress.

answer///malignant melanoma;