What can be said about animal and vegetal poles?
A. Isolated vegetal cells develop as ectoderm.
B. When animal pole cells are cultured with vegetal pole cells, some of the animal pole cells become mesoderm.
C. Isolated animal cells develop as endoderm.
D. When animal pole cells are cultured with vegetal pole cells, some of the vegetal pole cells become mesoderm.
Answer: B
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