Indicate whether the following organs or structures are derived from (a) the ectoderm, (b) the endoderm, or (c) the mesoderm.___(1) brain___(2) thymus___(3) kidneys___(4) fingernails___(5) heart___(6) pancreas___(7) visceral serosa___(8) glands of the skin

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A:

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Q: Layer A Layer B Layer C

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