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

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How do we differentiate between species that maintained traits due to survival and traits that persisted by random chance?

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Is it possible for multiple diseases/colds to "cancel" one another out?

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Do animals experience trauma?

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Can bacteria in our mouths become immune to toothpaste? Have they?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
How do we differentiate between species that maintained traits due to survival and traits that persisted by random chance?	1
Is it possible for multiple diseases/colds to "cancel" one another out?	1
Do animals experience trauma?	1
Can bacteria in our mouths become immune to toothpaste? Have they?	1