还有一片
W: it about the evolution of sea life, the octopus and the squid descened from earlier creatures with shells. They survived by shedding their shells somewhere between 200 and 500 million years ago.
M: that’s pretty long span of time.
W: I know. To be precise: “exactly when they emerged is uncertain?-and why is still unexplained.”
M: some squid are really huge. Can you imagine something that big if it still had a shell?
W: actually, it’s bcz they lost their shells that they could evolve to a bigger size.
M: make sense. But some are really huge. I’ve heard about fishermen that caught squid that weighed over a ton. Did she talk about how that happens?
W: not really. But she did mention some unusual cases. In 1933 in new Zealand they caught a squid, let’s see here-it was twenty two yards long. Its eyes were eighteen inched across. Can you imagine?
M: reminds me of all those stories of sea monsters.
W: Dr. xxx thinks there are probably even larger ones that haven’t been found because squid are intelligent and fast-so they can easily get away from humans. Maybe some of those monster stories are true.
|