A coelom is a body cavity lined with mesoderm surrounding the digestive organ or system. The term acoelomate means that the organism doesn't have a body cavity and the mesoderm is packed inbetween the ectoderm and the endoderm. Pseudocoelomates have a body cavity that is incompletely lined with mesoderm so their organs lie loose.
In protostomes, the mouth develops near the blastospore first, and then the anus forms. In deuterostomes however, the anus develo
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