List the facts that you would need to know to calculate the total tonnage of fish and crustaceans ea… Show more List the facts that you would need to know to calculate the total tonnage of fish and crustaceans eaten by all the world’s pinnipeds in one year. Now guess at the figures (or estimate them from information in this chapter or elsewhere) and make the calculation. How does your total compare with the yearly commercial fishing catch (about 80 million metric tons of fish and other organisms)? What do you think the captain of the Daedalus was looking at when he and his officers viewed the “sea serpent” in 1848? What evidence (noted in his letter) supports the idea that it was alive? Is there evidence that it was a drifting object? A hoax? Name three marine vertebrate species that have recovered in number after being given protection. List one reason why a population that has recovered from near extinction is more vulnerable to future extinction than is a widespread natural population that has never been decimated. Based on anatomy and zoogeography, which animals do you think have been adapting to life in the sea for a longer time, seals or sea lions? Why? • Show less