Question

lo 7.3. what is the name of the structure that forms during development when the embryo becomes a fluid - filled ball?
blastocyst
gastrula
zygote
morula
chorion

Explanation:

• Blastocyst: A blastocyst is a structure that forms during embryonic development. It is a fluid - filled ball of cells.
• Gastrula: A gastrula is formed after the blastocyst stage. It has three germ layers (ectoderm, mesoderm, endoderm) and is not a simple fluid - filled ball.
• Zygote: A zygote is the single - celled fertilized egg. It is not a fluid - filled ball of cells.
• Morula: A morula is a solid ball of cells (a mass of blastomeres) and does not have a fluid - filled cavity.
• Chorion: The chorion is one of the extra - embryonic membranes. It is not the fluid - filled ball - like structure of the early embryo.

Answer:

A. Blastocyst