The response is gastritis.
The union of the male and female gametes results in the formation of the zygote. To create the various embryonic stages of the progeny, the zygote goes through the process of cleavage.
The crucial process of pre-embryonic development is gastrilation. The gastrula is formed by the multiplication and rearrangement of blastula. Three germ layers, often known as triploblastic embryos, are formed during the gsatrulation process. Ectoderm, endoderm, and mesoderm are the three germ layers.
How they develop in the earliest embryonic stages is the primary distinction between protostomes and deuterostomes. The mouth opening forms initially in protostomes, followed by the anus. In deuterostomes, the mouth develops second after the anus.
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