Chapter 6

So apparently. ALL ANIMALS ARE VERY SIMILAR IN THE DEVELOPMENT OF THEIR BODIES. This is all because of three apparent germ layers. Each layer develops a different section of the body. But first, lets look at what happens. During development, tissues fold over each other multiple times until they look like tubes within tubes. The inner tubes work as the inner parts of the body and these tubes develop organs and the like. The outer tubes develop hair and that kind of outer stuff. So anyways, these three layers are called the endoderm(inside layers, develops organs) the mesoderm(middle layer, that develops the skeleton as well as the muscles) and finally, the ectoderm(this develops the skin and such). Finally, the way all these things develop in the way that they do(for example why the anus is not in front) is because of a certain thing called an operator. It is not a singular thing, but a combination of different chemicals that work together and directing the forming of the entirety of the body.