What Occurs During Gastrulation

question 23

Multiple Choice

What occurs during gastrulation?

• A)A hollow blastula is changed into a hollow embryo that has three tissue layers.
• B)A solid blastula is changed into a hollow embryo that has four tissue layers.
• C)A solid embryo is changed into a hollow morula.
• D)A neural tube is created by invagination of the ectoderm.

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A type of tax based on the assessed value of an item, typically used for customs purposes.

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