Genetic analysis verified the presence of chitin synthases, which are explained for the first time in the sponge. The presence of chitin in both of those marine (demosponges and hexactinellids) and freshwater sponges implies that this important structural biopolymer was previously present in their common ancestor. BITSAT Biology section is http://bansos-daftar03985.blogdun.com/7665911/facts-about-small-things-by-nthikeng-mohlele-theme-of-love-revealed