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SAT® Subject Test in Biology

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Identify Development Stage

SATBIO-VELUKF

Which of the following describes a blastula?

A

A triple-layered structure that has folded on itself with a blastopore as its opening.

B

A solid ball of cells composed of three germ layers.

C

A hollow ball of cells with a fluid-filled cavity called a blastocoel.

D

A fertilized egg.

E

An embryo with a folded neural crest.