The<unk>  is a membranous sac which surrounds and protects the embryo. It is developed in reptiles, birds, and mammals, which are hence called “Amniota”; but not in amphibia and fish, which are consequently termed “Anamnia”. The primary function of this is the protection of the embryo for its future development into a fetus and eventually an animal.
Amnion
Ethotoin
Triclofos
Kerosene
Wart
Cobaltocene
Bronopol
Formothion