Question

what is blastulation​

Answer 1

Blastulation is the formation of a blastula from a morula. The morula is an embryo filled evenly with cells (blastomeres), but the blastula contains a fluid cavity called blastocoel.

In developmental biology, the blastula (from Greek βλαστός (blastos), meaning "sprout") is a hollow sphere of cells (blastomeres) surrounding an inner fluid-filled cavity (the blastocoel) formed during an early stage of embryonic development in animals.

The blastula is made up of a hollow spherical layer of cells, referred to as the blastoderm which surrounds a yolk or fluid-filled space called the blastocele or blastocoel. In most mammals, including humans, the structure formed next is the blastocyst, a mass of inner cells that are distinct from the blastula.