The Middle Primary Germ Layer Is Called __________,Which Gives Rise

Multiple Choice

The middle primary germ layer is called __________,which gives rise to a gelatinous material called __________,which then gives rise to different types of connective tissue such as bone,cartilage,and blood.

A) ectoderm;stem cells
B) mesoderm;mesenchyme
C) endoderm;mesenchyme
D) mesoderm;fibroblasts
E) ectoderm;mesenchyme