Question

multiple choice question
what kind of animal body cavity forms completely within the mesoderm?
osculum
pseudocoelom
periderm
coelom

Explanation:

• Osculum: It is a structure in sponges (porifera) for water exit, not a body cavity.
• Pseudocoelom: It is a body cavity not completely lined by mesoderm.
• Periderm: It is a plant tissue (bark - like structure in some plants), not related to animal body cavities.
• Coelom: It is a true body cavity that forms completely within the mesoderm.

Answer:

coelom