Three
Three
3
A blastula typically consists of a single layer of cells called the blastoderm. This layer forms during early embryonic development and surrounds a fluid-filled cavity called the blastocoel.
Blastula only formed when the morula, a ball of cells is surrounded by a fluid-filled cavity. It is also produced by repeated cleavage of a fertilized egg.
A zygote divides repeatedly through the process of cleavage to form a blastula. Cleavage involves a series of rapid cell divisions without cell growth, resulting in a multicellular structure called a blastula with a hollow, fluid-filled center called a blastocoel.
forty-six layers
2 layers of lipids.
71 microscopic layers
The blastula is a stage of growth of a fertilized animal egg. It has about 128 cells, and follows the formation of a blastocyst by the "morula" stage (it precedes implantation in the endometrium).
2 layers
3
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