Question

What is a germ layer? Please explain in very simple words.

Answer 1

Germ layer:

1. A germ layer is a group of cells in an embryo that interact with each other as the embryo develops and contribute to the formation of all organs and tissues.
   
2. All animals, except perhaps sponges, form two or three germ layers.​
   
3. The germ layers develop early in embryonic life, through the process of gastrulation.
   
4. It consists of the endoderm (inner layer), the ectoderm (outer layer), and the mesoderm (middle layer) in organisms with three germ layers like humans.
   
5. Together, the three germ layers will give rise to every organ in the body, from skin and hair to the digestive tract.