Space, because there is a limited amount of room on the rock does not limit the barnacle population on the rock. so the correct option is A. Barnacles spend their entire lives in their conical shells.
They live standing on their heads and, when the tide comes in, they open their trap doors and wave their legs in the water hoping to catch bits of plankton.
What is barnacles?
Barnacles are sticky little crustaceans related to crabs, lobsters, and shrimps.
Few species of barnacle are parasitic and most barnacle species are harmless to other animals. They filter feed food particles out of the water and do not harm the animal they live on.
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