Question

sponge knowledge check
sponges are flexible because they contain a protein material called ________.
amoebocytes
spongin
spicules
porocytes

Explanation:

• Amoebocytes: These are cells in sponges that have various functions like transporting nutrients, but they are not the protein material for flexibility.
• Spongin: It is a protein - based fibrous material that gives sponges their flexibility.
• Spicules: These are structural elements (can be made of silica or calcium carbonate in some sponges) that provide rigidity rather than flexibility.
• Porocytes: These are cells that form pores in sponges for water flow, not related to flexibility.

Answer:

spongin