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Originally posted by buds84due to the Ozone layer being young and something with the oxygen being younger/cleaner.
Originally posted by buds84
Well long time ago on Earth, everything was way bigger ...
Meganeura monyi was a prehistoric insect of the Carboniferous period (300 million years ago), resembling and related to the present-day dragonfly. With a wingspan of more than 75 cm (2 feet) wide, it was the largest known flying insect species to ever appear on Earth.
These giants crawled and crept, slithered and scurried, burrowed, slinked, skittered and, above all, flitted and fluttered millions of years before the dinosaurs arrived.
They were the giant arthropods of the Carboniferous.
There were extra-large mayflies, supersized scorpions and spiders the size of a healthy spider plant. There was an array of giant flightless insects, and a five-foot-long millipede-like creature, Arthropleura, that resembled a tire tread rolled out flat.
But perhaps the most remarkable of all were the giant dragonflies, Meganeuropsis permiana and its cousins, with wingspans that reached two and a half feet. They were the largest insects that ever lived.
Scientists have long suspected that atmospheric oxygen played a central role in both the rise and fall of these organisms. Recent research on the ancient climate by Dr. Robert A. Berner, a Yale geologist, and others reinforces the idea of a rise in oxygen concentration - to about 35 percent, compared with 21 percent now - during the Carboniferous.
There appears to be no reason why life could not evolve across a wide range of gravities. Both crushing pressure and near-weightlessness are handled with aplomb by Earth-based life. High gravity could be expected to result in stocky, multi-legged creatures with very fast reaction times. (A classic on the subject is Hal Clement's Mission of Gravity.) Low gravity organisms would likely be more delicate, possibly balance on two or even one foot, and would have the option of airborne existence. What is perhaps less obvious is that high gravity would correlate with a thicker atmosphere and higher water content. Skies would be thicker, yellower if the atmosphere is like ours, mistier or cloudier. The thicker atmospheric blanket means that high-gravity worlds in an otherwise hostile stellar neighborhood would have a better chance of harboring life than low-gravity planets. Dickinson and Schaller have two drawings (below) envisioning how all the gravity-related factors would mesh.
Originally posted by Arbitrageur
I don't know about everything, but many things were much bigger in ancient earth, like this dragonfly with a wingspan of over 2 feet across:
Originally posted by zorgon
Can you picture those mosquitoes that had a stinger big enough to go through Dino Hide? I mean they must have, other wise how could Jurassic Park have extracted Dino DNA from mosquitoes in amber?
Originally posted by Arbitrageur
Jurassic Park had those mosquitoes encased in Amber to preserve them, but I'm not sure if even the "general Sherman Tree" could make an amber blob big enough to contain that thing!