Protein fibers and ______ are the main supporting structures for sponges.

The tough skeletal fibers and spicules that support the body of a sponge are formed by what type of cells?Multiple choice question.CnidocytesChoanocytesAmoeboid cellsEpithelial cells

Which structure is formed by a group of collagen fibers?

What is the name of the gelatinous, protein-rich matrix found between the inner and outer cell layers in a sponge (amoebocytes and eggs are found within this matrix)?Multiple choice question.Gastrovascular cavityOsculumCoelomMesohylMesoglea

What type of cells surround the body of a sponge?Multiple choice question.AmoebocytesEpithelial cellsSpiculesChoanocytes

What is the name of the contractile protein fibres within muscle fibres?