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ectoderm.
The mesoderm
The outermost, middle, and innermost layers are the ectoderm, mesoderm, and endoderm, respectively.
Gastrula (early gastrula follow the blastula in the development sequence) ~ As a result of gastrulation, a three-layered embryo forms, each layer corresponding to a primary germ layer from which all body tissues develop.
The ectoderm is the germ layer covering the surface of the embryo and develops into the outer covering of the animal (in our case, our skin) and in some phyla, the nervous system. The mesoderm forms the muscles and most other organs between the digestive tract and the outer covering of the animal. The endoderm, which is the innermost germ layer, lines the developing digestive tube (referred to as the archenteron) and gives rise to the lining of the digestive tract or cavity and organs derived from it, such as the liver and lungs.
The endoderm is the germ layer that will become the inner lying of the body cavity as well as on the surface of the organs. Meaning of endoderm is: Endo- = within, plus derm = germ or from.
endoderm
pseudocoelom
First one has three and the second one has two germ layers.
It develops from the endoderm germ layer
Gastrulation is first step towards germ layer development .
There are three, Outer Layer of Cells, Gelatinous Layer of Cells, and Inner Layer of Cells
Porifera, which includes sponges, do not have true germ layers like other animals. They lack specialized tissues and organs, making them the simplest multicellular organisms.
ectoderm.
endoderm
endoderm
Ectoderm