Which one of the following is a membrane that protects the developing embryo from desiccation?

1. The question asks to identify the membrane that protects the developing embryo from desiccation (drying out). 2. During embryonic development in amniotes (reptiles, birds, mammals), several extraembryonic membranes form to support and protect the embryo. 3. The Amnion is the innermost membrane, which encloses the embryo in a fluid-filled cavity called the amniotic sac. 4. The amniotic fluid within this sac serves multiple crucial functions: it cushions the embryo against mechanical shock, allows for movement, maintains a stable temperature, and most importantly, prevents the embryo from drying out (desiccation). This adaptation was essential for vertebrates to reproduce on land. 5. The Allantois is involved in waste storage and gas exchange. The Chorion is the outermost membrane, involved in gas exchange and placenta formation. The Yolk sac contains yolk for nutrition.