-A Mad Scientist Decides to Start Combining Embryos and See

-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) endoderm
B) mesoderm
C) ectoderm
D) yolk sac
E) allantois

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