Answer:
A
The heat that the ocean absorbs is mixed with the lower water quickly. That mixing spreads the heat around. At night, while the land cools off quickly, the water at the surface is kept warmer because the water is mixed around with the warmer water underneath.
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I would say that they were nurses for injured men.
Quartnerary is our time period or it may have been the period before that. But it's the most recent era. Cambrian was full of early life forms, mostly water based. Devonian is sometimes referred to as the 'Age of the Fish'. Triassic was one of the 3 main dinosaur periods, others being Cretaceous and Jurrasic. So the answer is Triassic