Question

The _____ is the layer of tissue that forms during gastrulation and becomes the animal's organs.

a. ectoderm
b. mesoderm
c. endoderm

Answer 1

b. mesoderm

Explanation:

Out of the three germ layers, it is mesoderm from which develops organs in an animal. Visceral organs like kidneys, heart, spleen etc all are developed from mesoderm during gastrulation. Basically the entire connective tissue is derived from mesoderm which includes bones, blood, blood vessels, lymphatic system, cartilage etc. Mesoderm is the characteristic feature of triploblastic animals which develops between ectoderm and endoderm. In diploblastic animals mesoderm is absent.

Answer 2

I believe the correct answer from the choices listed above is option B. The mesoderm is the layer of tissue that forms during gastrulation and becomes the animal's organs. It is one of the three primary germ layers in the very early embryo. Hope this answers the question.