Bioidentical hormone therapy is often called natural hormone therapy because bioidentical hormones act in the body just like the hormones we produce.But here again, that tricky word natural muddies the waters.ioidentical hormone therapy is often called natural hormone therapy because bioidentical hormones act in the body just like the hormones we produce.
Some bivalves, which are mollusks, have bilateral symmetry. Radial symmetry is typical of starfish, urchins, and sea anemones, which are echinoderms.
The phylum Annelida, segmented worms, is characterized by the possession of a coelom (body cavity), setae (moving bristles), and a body divided into segments by transverse rings. The class Polychaeta, meaning many hairs, is a large and extremely diverse group with more than 6,000 living species.