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saw5 [17]
3 years ago
10

Help please I'm stuck #life sciences​

Biology
1 answer:
Leona [35]2 years ago
3 0

hope this helps

I do think that they close to not allow too much of either water or air from entering.

the hollow tube allows water to flow easily.

https://www.bbc.co.uk/bitesize/guides/z28g7p3/revision/1

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