The great size of ancient fauna remains a major unsolved mystery - one which I have looked around for an answer to but continually come away unsatisfied. The fossil records indicates some variable in the environment at the time which we do not understand fully. Theories abound, none of them seem correct to me. Personally, I think the answer is tied up in physics and what it ultimately has to say about planetary formation and evolution.
Originally Posted by wd40
What I think it shows in the meantime is life's great adaptability - a great variation which has occurred over a very short evolutionary time.
Not sure where Clarke is coming from in the context of any possible future, but given that size appears to have been bigger in the past, the future trend appears likely to be smaller rather than bigger.
"It's the rabbit hole that matters, not the blackhole, the wormhole or any other hole," the wolf said.
"But, what's in the hole, Mr. Wolf?", came the question after a long pause.
"Infinite approximations deciding everything exactly with just enough uncertainty." The wolf howled with some difficulty.
"What about the rabbit?", was the next question.
"Oh, he's long gone!", the wolf declared instantly.