Answer: Fragmentation
When the body breaks up into several fragments and each fragment starts to live as a new individual, it is fragmentation, a type of asexual reproduction in multicellular organisms. For example, the filaments of the alga Spirogyra break into small pieces when water and nutrients are plentiful, and each piece grows into a new filament; a broken Sycon (sponge) also gives rise to new Sycons.