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Biology, 25.09.2019 21:30 jamielytle

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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