The answer is A, 'a mammal' because it goes with the copulative verb 'to be', i. e., 'is'.
False . Genetic mutations are random
Well, to answer your first question, Because there are places on Earth that are both biologically rich — and deeply threatened. For our own sake, we must work to protect them. and for your 2nd question, 3 characteristics of magnetic reversal are: field, bar magnet, and molten material. Hope this helps