EVERYDAY SCIENCE

Detailed explanation-1: -Parts of a Gastrula Invagination during gastrulation produces a pocket or space called the archenteron. This is just like the pocket you formed in your balloon, and it will develop into the gut or digestive system of an animal. The opening of the archenteron is called the blastopore.

Detailed explanation-2: -Protostomes versus Deuterostomes. The majority of coelomate invertebrates develop as protostomes ("first mouth") in which the oral end of the animal develops from the first developmental opening, the blastopore.

Detailed explanation-3: -Protostome and deuterostome are terms for members of major taxonomic groups of animals categorized by how they develop as embryos. In protostomes, the first opening in the embryo becomes the mouth. In deuterostomes, the first opening in the embryo becomes the anus, and the mouth develops later.

Detailed explanation-4: -After gastrulation, if the first opening, the blastopore becomes the mouth, the animal is called a protostome 2.