The shell of a bivalve is composed of calcium carbonate, and consists of two, usually similar, parts called valves. These are joined together along one edge (the hinge line) by a flexible ligament that, usually in conjunction with interlocking teeth on each of the valves, forms the hinge.rachiopods are shelled marine organisms that superficially resembled bivalves in that they are of similar size and have a hinged shell in two parts. However, brachiopods evolved from a very different ancestral line, and the resemblance to bivalves only arose because of a similar lifestyle.
Specialty doctors. If youâre working as a specialty doctor youâll earn a basic salary of Â£37,923 to Â£70,718. Consultants. As a consultant you'll earn a basic salary of Â£76,761 to Â£103,490 per year, depending on the length of your service.
Among the highest paid medical doctors are surgeons, who earn an amazing average $230,540 each year for performing invasive and non-invasive surgical procedures. Work Environment. With all specialty fields combined, there are an estimated 691,000 jobs in the medical field for doctors.eneral practitioners that find employment within medical diagnostic laboratories tend to make the most, with an annual salary of $238,270. Pediatricians, who specialize in providing treatment and care to children, earn an average salary of $167,640 each year, which equals a mean hourly wage of $80.59.