Final answer:
True coelomates and pseudocoelomates both have a coelom that helps cushion internal organs, but there is a difference in the tissue that surrounds the coelom.
Step-by-step explanation:
Both true coelomates and pseudocoelomates have a body cavity called a coelom. In both cases, the coelom helps cushion internal organs, providing protection and support. However, there is a key difference in the tissue that surrounds the coelom. In true coelomates, the coelom is surrounded by mesoderm tissue on the outside and endoderm tissue on the inside, while in pseudocoelomates, the coelom is lined with mesoderm and endoderm tissue.