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Can we settle this: how many holes does a straw have? (lemmy.world)

submitted 1 year ago by RealNooshie@lemmy.world to c/asklemmy@lemmy.world

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At work we somehow landed on the topic of how many holes a human has, which then evolved into a heated discussion on the classic question of how many holes does a straw have.

I think it's two, but some people are convinced that it's one, which I just don't understand. What are your thoughts?

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[-] Petrichor3345@kbin.social 3 points 1 year ago

IIRC humans have 7 holes topologically (assuming both vsauce and my memory are correct). I'm not sure how many a flatworm would have, but I bet you could group animals by number of holes topologically, which might be interesting.

[-] GreenPlasticSushiGrass@kbin.social 1 points 1 year ago

Flatworms have a single opening that leads to a branching cavity (an incomplete digestive system). This means that the single opening is for both ingesting nutrients and expelling waste. While your mouth may be attached to your anus via the alimentary canal, I think it beats the hell out of having one multi-purpose opening, imho.

[-] Petrichor3345@kbin.social 1 points 1 year ago

Right, technically a human only has 1 hole for ingesting nutrients and expelling waste as well though, assuming you are talking about the mouth and anus. Does a flatworm have any other through holes though e.g. nostrils or tear ducts? I have no idea what the biology of a flatworm is haha.

[-] GreenPlasticSushiGrass@kbin.social 1 points 1 year ago* (last edited 1 year ago)

No, gas exchange is by simple diffusion across the skin and gut. No ears or eyes per se, just some photosensitive cells in slight depressions on the head. Planaria are pretty simple as far as animals go.

[-] key@lemmy.keychat.org 1 points 1 year ago

Two ears, mouth/anus/nostrils, urethra, optionally vagina. That's 5...what else, eye sockets?

this post was submitted on 04 Jul 2023

292 points (94.5% liked)

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