Biology

Cannon Mcclure

3 May, 10:42

John is observing a few slides of a human embryo. The first slide shows a neural tube and the second just a compact mass of cells. Which phases of human embryos are the slides?

A. First slide: blastula; second slide: gastrula

B. First slide: gastrula: second slide: neurula

C. First slide: neurula: second slide: morula

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