Identify each method of reproduction in sponges. occurs when a sponge breaks into two or more pieces, each capable of growing into a new adult. Each piece grows into a new adult through the process of | occurs when sperm are released into the water by one sponge and drawn into another sponge, where one sperm fertilizes an egg. occurs when an outgrowth forms on an existing sponge and develops there until it can grow on its own. Then, it drops off of the parent to become an adult.