1. Budding: Budding is a form of asexual reproduction that involves a parent organism forming a protrusion that will form into a new organism. This is a common form of extra embryonic membrane formation in single-celled organisms, such as yeast. 2. Binary Fission: Binary fission is another form of asexual reproduction in which a single cell splits into two identical daughter cells. During this process, new membranes are formed which will eventually become extra embryonic membranes. 3. Fragmentation: Fragmentation is a process in which a parent organism breaks off parts of its body which will grow into new organisms. This is a common form of extra embryonic membrane formation in many multicellular organisms. The main function of extra embryonic membranes is to provide protection for the embryo. They act as a barrier to prevent infection and damage to the developing organism. They also assist in nutrient and waste exchange, as well as providing physical support during embryonic development.