I think the answer could be B
That they were probably on land and that they evolved into sea animals or that that mountain used to be an ocean or water source and that it dried up and a mountain grew there. I'm not positive that this is correct though.
Answer:
they are used for protection, maneuvering, and to trap food for consumption
Explanation:The spikes of the sea urchin are used for protection, to move about, and to trap food particles that are floating around in the water.
They can learn from other scientists mistakes and build off successes or failures.