/u/itoa5t's posts in /r/askscience

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If every cell in our body is replaced every 7 years or so, why do we age?

5 upvotes

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Does a dog (e.g. a German Shepard) know that another dog (e.g. a pug) is a dog and just a different breed? Or do they think it's a completely different species?

1 upvotes

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Why does it seem like all prehistoric creatures were bigger? Are there known cases of a species getting larger in the present? And what cause these large animals to become smaller?

1 upvotes

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
If every cell in our body is replaced every 7 years or so, why do we age?	5
Does a dog (e.g. a German Shepard) know that another dog (e.g. a pug) is a dog and just a different breed? Or do they think it's a completely different species?	1
Why does it seem like all prehistoric creatures were bigger? Are there known cases of a species getting larger in the present? And what cause these large animals to become smaller?	1