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3. Darwin did not have the tools nor equipment to observe life under the ocean.

4. It is important for penguins to preen (clean) their feathers because healthy feathers will lock together to keep out water. Their feathers create a waterproof barrier between their skin and the ocean.

5. Blue hill tortoises are endangered which means humans hunted and killed them. Being bred in captivity provides a safer environment for the tortoises and gives their population a chance to increase.

the answer to your question is:

c. complementary base-pairing

the law of original horizontality explains:   why rocks appear in layers. correct answer: b the law suggests that all rock layers are originally laid down (deposited) horizontally and can later be deformed.   the principle is used by geologists to make assumptions about the relative ages of sedimentary rocks.