Final answer:
Protostomes and Deuterostomes are two groups of organisms with different ways of developing as embryos. The mouth and anus develop in different orders and the coelom forms differently.
Step-by-step explanation:
Protostomes and Deuterostomes are two groups of organisms that have different ways of developing as embryos. The main difference between them is the order in which the mouth and anus develop. In protostomes, the mouth develops from the blastopore, while in deuterostomes, the anus develops from the blastopore. Another difference is the mode of formation of the coelom, the body cavity. In protostomes, the coelom forms within the mesoderm, while in deuterostomes, it forms from a pouch of endoderm.