Animals with a body cavity that is completely lined by mesoderm are called __________, whereas those in which the body cavity is not lined by mesoderm are termed __________.
1. acoelomates; coelomates
2. pseudocoelomates; coelomates
3. coelomates; pseudocoelomates
4. diploblastic; triploblastic
Subtopic:  Basis of classification |
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