Answer:
this shows that at one point these animals lived on the surface because there were plants for them to eat
Explanation:
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I think it is keystone. If they were not there the population of urchins would go up and the kelp would go down.
Answer:
Cancer cells also make enzymes that break down normal cells and tissues as they grow. Cancer that grows into nearby tissue is called local invasion or invasive cancer. Cancer can also spread from where it first started to other parts of the body. This process is called metastasis
Answer:
There would be more Sea Urchins
Explanation:
There would be more Sea Urchins because there would be nothing hunting them. Causing their population to increase.
