<span>Separate populations of the species with distinctive profiles, perhaps even the start of speciation, or multiple species descended from the original one.
This is because it's diversifying, with many different traits changing.</span>
The three germ layers are the endoderm, the ectoderm, and the mesoderm. Cells in each germ layer differentiate into tissues and embryonic organs. The ectoderm gives rise to the nervous system and the epidermis, among other tissues. The mesoderm gives rise to the muscle cells and connective tissue in the body.
Clearly the onion cell consists of a cell wall, because an onion is a multicellular plant organism.
Multicellular means; consisting of many cells.
enzyme activity, cell to cell recognition, cell signalling, transporting materials
