/u/slippy0101's posts in /r/askscience

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Why were enantiornithes the dominant small, flying dinosaur before the K-Pg extinction event whereas aves seemed to be a small, niche group of species? Which features made enantiornithes better suited for that world than aves?

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Assume there is a water-breathing, space faring civilization. If the cold and pressure wasn't an issue, could they "breath" in the water that is theoretically on Europa or other moons without advanced technology?

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When looking at mammal orders, almost all have a temporal range beginning around 65 mya. I know why, but what did the overall mammal diversity look like before then?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
Why were enantiornithes the dominant small, flying dinosaur before the K-Pg extinction event whereas aves seemed to be a small, niche group of species? Which features made enantiornithes better suited for that world than aves?	6
Assume there is a water-breathing, space faring civilization. If the cold and pressure wasn't an issue, could they "breath" in the water that is theoretically on Europa or other moons without advanced technology?	1
When looking at mammal orders, almost all have a temporal range beginning around 65 mya. I know why, but what did the overall mammal diversity look like before then?	1