Atmosphere and gravity: venus has a thick atmosphere, and titan does as well. Thing is the closer you're to a sun the faster you're gonna loose atmosphere, but again, venus doesn't have a strong one and it has a mad thick atmosphere. surface pressure is a function of how much gas there is on the system to begin with. there's a lot of ways in which planets gain gas, and a lot more in which they loose it.
Interesting thing, about hopping and heat buildup. so indeed jumping would be more common with things.
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Maybe the radiator need not be quite as efficient if the gonads are located somewhere else? This is an alien world we are talking about.
nah, most of the life is terrestrial, adapted to the planet, but terrestrial in origin. As for radiating, a thicker atmosphere and a much colder overall climate distribution [temperate along the equator, positively siberian at mid-latitudes] should make it easier. Hop hop hop.
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Yes, things would be more gracile
I know this is like the consensus, but I'm not sure its true. On earth, for instance, smaller mammals, which face a much smaller resistence/gravity, aren't very much more gracile than medium-sized things. for a smaller things gravity is les of an issue; ants can get away with having very thin limbs, but elephants don't. However, if you look at very large things that have existed, like dinosaurs, many got away with being very very heavy and still being kinda gracile: take allosaurus or hadrosaurus. Also, consider a gazelle -real thin and gracile- versus, say, an armadillo. Gracility to me seems like more a function of metabolism and the need for quick movement than about the effects of gravity, at the meso level at least [say, from rabbits to allosaurus]
OTOH one could understand gracility like an expensive trait: sure, you can be as gracile as you want, but its gonna cost you in terms of energy, and the less the gravity, the cheaper it is to be gracile. The question is, is gracility an advantageous trait always?.
shit, this is hard!