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.
Molluscs and annelids also share a eucoelomate body cavity; i,e,. the coelom is completely lined with mesoderm tissue. A major difference between them is that annelids are segmented and have a closed circulatory system whereas molluscs are not segmented and have an open circulatory system.Phylum: Mollusca - [soft body] snails, bivalves, squid and octopi. Molluscs are a diverse group with over 50,000 described species.nnelids are characterized by having elongate, conspicuously segmented body. Unlike the molluscs with their reduced coelom, annelids have a large coelom that is divided by septa between individual segments. Extreme segmentation believed to be an adaptation for burrowing in soil.