An egg is the organic vessel containing the zygote in which an animal embryo develops until it can survive on vertebrates, and mollusks lay eggs, although some, such as scorpions and most mammals, do not.
An egg is the organic vessel. This organic vessel is containing the zygote in which an animal embryo develops until it can survive on vertebrates. Mollusks lay eggs. Some do not. This is such as scorpions. This is such as most mammals.