Question

dr. swift tells iolana that her developing embryo is showing distortions in the development of its circulatory system. as a knowledgeable student of human development, iolana should realize that the problem is within cells of the layer.
a. ectoderm
b. mesoderm
c. placenta
d. endoderm

Explanation:

The mesoderm gives rise to the circulatory system during embryonic development.

Answer:

B. mesoderm