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A mad scientist decides to start combining embryos and see what develops. He takes cells from the blastula of a frog with blue skin and transplants them into the blastula of a yellow-skinned frog. The embryo receiving the cells develops blue cells in its brain and spinal cord. The scientist must have transplanted the cells into the ________ of the recipient embryo.A) ectodermB) mesodermC) endodermD) allantoisE) yolk sac

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