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I accept extinction as best explaining disjoined species. I see that the same cause must have reduced many species of great range to small, and that it may have reduced large genera to so small, and of families.

Oceans are one of the most important things in the world now and that is a national security threat of the United States of America, to be honest with you. That is why seeing the habitat destroyed is so short-sighted by us.

Remove the predators, and the whole ecosystem begins to crash like a house of cards. As the sharks disappear, the predator-prey balance dramatically shifts, and the health of our oceans declines.

There are so many issues in our oceans - like the near extinction of blue fin tuna - that should be taken more seriously worldwide.

The amazing thing about the sea is that it is perhaps the last truly unexplored frontier; most oceanographers estimate that only about ninety-five per cent of the sea has been studied. Meanwhile, the oceans are believed to contain more animals than exist on land, a majority of which have never been discovered.

Species go extinct because there are historical contraints built into a given body or a given design.

Practically the whole world depends on coral reefs, so if the coral reefs get all killed, then the ocean will start going out of whack, and if the ocean goes out of whack, something might happen on land.

Land bridges were everywhere during the extinction, many species were spreading, and there were many diseases.

As species are exterminated by shifting climate zones, ecosystems can collapse, destroying more species.

It's a fair guess that at the rate we're destroying habitat, especially but not exclusively in the tropics, we're pushing to extinction about one species every hour. That doesn't count the species whose populations are being reduced so greatly that diversity within the population is essentially gone.