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Problem: A __________ is a hollow ball of cells of an early animal embryo.a. coelomb. gastrulac. blastulad. blastoporee. inner cell mass

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Cleavage: zygote undergoes multiple cell division with no significant growth → cytoplasm is partitioned to several cells

• Formation of a blastula

Gastrulation: establishment of embryonic germ layers

• Formation of a gastrula

Blastopore is differentiated → becomes either the mouth or anus

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Problem Details

A __________ is a hollow ball of cells of an early animal embryo.

a. coelom
b. gastrula
c. blastula
d. blastopore
e. inner cell mass

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