The Nervous System and The Endocrine System.
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
Grow, reproduce, take in nutrients from the environment, respond to the environment, transport materials thru-out their body, produce chemicals
<span>The primary hypothesis is that they were led to extinction by hunting by humans.
I hope this helps! :)
Have a wonderful day!</span>
