Typical animal embryos have a(n) ________, or external cell layer, and a(n) ________, which lines the digestive tract.

Question

Quizplus · Accepted Answer

The ectoderm is the outer layer of cells in animal embryos, and the endoderm lines the digestive tract. The blastula is a stage of embryonic development in which the embryo is a hollow ball of cells, and the mesoderm is the middle layer of cells that forms between the ectoderm and endoderm in some animal embryos, but not all.

Typical Animal Embryos Have A(n) ________, or External Cell Layer