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