The primary germ layers that develop during the pre-embryonic period include all of the following EXCEPT
A) ectoderm
B) mesoderm
C) endoderm
D) mesenchyme

Question

Quizplus · Accepted Answer

During the pre-embryonic period, the primary germ layers that develop are ectoderm, mesoderm, and endoderm. Mesenchyme is not considered a primary germ layer, as it is a loose collection of embryonic connective tissue cells that can differentiate into various types of tissues.

The Primary Germ Layers That Develop During the Pre-Embryonic Period