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A lab is studying the process of gastrulation in sea urchin embryos. They label a cell with a fluorescent dye during the blastula stage using a microinjector. They follow the cell during development and find that during gastrulation, the cell migrates inward during the formation of the gastrula.

Which germ layer will this cell ultimately become?

A

Endoderm.

B

Ectoderm.

C

Mesoderm.

D

Trophectoderm.

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