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It develops from the endoderm germ layer
Skin develops from ectoderm.
Muscle tissues are derived from the mesodermal layer of the embryonic germ cells through a process called myogenesis.
endoderm
A germ layer, occasionally referred to as a germinal epithelium, is a group of cells, formed during animal embryogenesis. Germ layers are particularly pronounced in the vertebrates; however, all animals more complex than sponges (eumetazoans and agnotozoans) produce two or three primary tissue layers (sometimes called primary germ layers). Animals with radial symmetry, like cnidarians, produce two germ layers (the ectoderm and endoderm) making them diploblastic. Animals with bilateral symmetry produce a third layer between these two layers (appropriately called the mesoderm) making them triploblastic. Germ layers eventually give rise to all of an animal's tissues and organs through the process of organogenesis.
It develops from the endoderm germ layer
Skin develops from ectoderm.
Ectoderm, endoderm, and mesoderm can produce epithelial tissues
Mesoblasts are a type of embryonic stem cell that give rise to the mesoderm, one of the three primary germ layers in early development. Mesoderm gives rise to various tissues and structures in the body, including muscle, bone, cartilage, and blood vessels. Mesoblasts are important for tissue development and regeneration.
There are different forms of mesenchymal cells and tissues found almost everywhere in the body, and these tissues can be thought of, broadly, as: connective tissues, blood vessels, and lymphatic vessels.Mesenchymal cells/ tissues originate from the middle embryonic germ layer (there are 3 - endoderm, mesoderm, ectoderm) called the "mesoderm" and differentiate into the body's various connective tissues found in bone, cartilage, ligaments, tendons, muscles, skin, organs, extracellular matrix, as they also form the blood vessels and lymphatic vessels.
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.
No they do not. I am not certain as to whether they have 0 or 2 germ layers but it is one of the two.
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.
Muscle tissues are derived from the mesodermal layer of the embryonic germ cells through a process called myogenesis.
mesoderm
Gastrulation is first step towards germ layer development .
mesoderm The mesoderm forms: skeletal muscle, the skeleton, the dermis of skin, connective tissue, the urogenital system, the heart, blood (lymph cells), the kidney, and the spleen.