Embryo
Embryos are multicellular eukaryotes in the earliest stage of development, from the time of first cell division to birth, hatching, or germination. For humans, it is called embryos up to about eight weeks after fertilization, and from then on called the fetus. The development of the embryo is called embryogenesis. For sexually reproducing organisms, when the sperm is compounded with egg cells, the result is a cell called a zygote, which inherits half the DNA of each parent. For plants, animals, and some protests, the zygote will split mitosis to produce a multicellular organism. This process is the embryo.