The flagella and collar work together to gather food.

Sponges use the flagella to move when they are larvae. It’s a cell that has three basic parts: flagella collar and cell body. Those flagella are part of a cell called a choanocyte. Amoebocytes can also digest the food and carry nutrients to other cells. The food is captured by choanocytes and also amoebocytes who can digest it. Sponges are filter feeders and retrieve their nutrition from filtering the water that enters their pores and exits their osculum.

As it passes through the channels and chambers inside the sponge bacteria and tiny particles are taken up from the water as food. … Water exits through larger pores called excurrent pores. In order obtain food sponges pass water through their bodies in a process known as filter-feeding.

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