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

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What was dry land like at the time when first tetrapods crawled out of the oceans?

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Both cats and dogs have little "pocket" on outer side of their ears (pinnae); what is its name?

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Has sexual reproduction developed independently in plants, fungi and animals or do they all descend from common sexually-reproducing ancestor?

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What is the biggest animal on Earth whose population is larger than that of humans?

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What is the biggest animal on Earth whose population is larger than that of humans

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What causes this optical phenomenon in this timelapse clip?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
What was dry land like at the time when first tetrapods crawled out of the oceans?	10
Both cats and dogs have little "pocket" on outer side of their ears (pinnae); what is its name?	1
Has sexual reproduction developed independently in plants, fungi and animals or do they all descend from common sexually-reproducing ancestor?	1
What is the biggest animal on Earth whose population is larger than that of humans?	1
What is the biggest animal on Earth whose population is larger than that of humans	1
What causes this optical phenomenon in this timelapse clip?	1