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What are barnacles?
Barnacles are shrimp-like arthropods that swim free when young then glue themselves to some hard surface and spend the rest of their life kicking food into their mouths with their feather-like legs.
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What is a sessile?
In botany it means stalkless and attached directly at the base, like sessile leaves.In zoology it means permanently attached or fixed and not free-moving like an adult barnacle.
As an aside: It is a...
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Is hydra sessile or non sessile?
a hydra as a polyp is not sessile but when it grows to be a hydra it is sessile
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Do barnacles have a skeleton?
They have a hard shell (a skelleton is made of bones, their shell is just calcium) and they live in their shell and only come out as the tide rises and their shell becomes exposed to water.
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Is a sponge sessile?
yes