What are the tube feet on a star fish

They are used to pass food to the oral mouth at the center, and can attach to surfaces.

This is a question for the biology section, however, here is the answer.
Tube feet are used for holding onto things, moving around, and opening the shells of clams and oysters. These tube feet are connected to the radial canals of the starfish.

Adozen is 12, and your needing to calculate the weight of one medium egg, so i would do 21/12=1.75 per egg, and check your answer by doing 1.75 * 12= 21 : ) : ): ): ): ) i hoped i