The outer-to-inner sequence of tissue layers in a post-gastrulation vertebrate embryo is
A)mesoderm → ectoderm → endoderm.
B)mesoderm → endoderm → ectoderm.
C)ectoderm → mesoderm → endoderm.
D)ectoderm → endoderm → mesoderm.
E)endoderm → mesoderm → ectoderm.

Question

Quizplus · Accepted Answer

The correct sequence from outer to inner is ectoderm (outermost layer), mesoderm (middle layer), and endoderm (innermost layer). This reflects the basic organization of tissue layers in a post-gastrulation vertebrate embryo.

The Outer-To-Inner Sequence of Tissue Layers in a Post-Gastrulation Vertebrate