A form of asexual reproduction that occurs during environmental hardship conditions. In lower forms of invertebrates, it is common for harmful conditions or seasonal change (extreme temperatures, lack of water, lack of oxygen) to control means of reproduction.
A reduction body is a cluster of amoebocytes also known as "internal buds" because they develop inside the body of the sponge. When the adult is killed by harsh conditions, it disintegrates and the reduction bodies are carried off where they can later develop into adult sponges when conditions are favorable.
A type of regeneration in which each parent sponge may form dozens of reduction bodies. This is not just a survival mechanism.