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2. Bivalvia - Wikipedia

   en.wikipedia.org/wiki/Bivalvia

   Bivalvia (/ b aɪ ˈ v æ l v i ə /) or bivalves, in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class of aquatic molluscs (marine and freshwater) that have laterally compressed soft bodies enclosed by a calcified exoskeleton consisting of a hinged pair of half-shells known as valves.

3. Hemicorporectomy - Wikipedia

   en.wikipedia.org/wiki/Hemicorporectomy

   Hemicorporectomy is a radical surgery in which the body below the waist is amputated, transecting the lumbar spine. This removes the legs , the genitalia (internal and external), urinary system , pelvic bones, anus , and rectum .

4. Brachiopod - Wikipedia

   en.wikipedia.org/wiki/Brachiopod

   Brachiopods (/ ˈ b r æ k i oʊ ˌ p ɒ d /), phylum Brachiopoda, are a phylum of animals that have hard "valves" (shells) on the upper and lower surfaces, unlike the left and right arrangement in bivalve molluscs. Brachiopod valves are hinged at the rear end, while the front can be opened for feeding or closed for protection.

5. Gnathostomata - Wikipedia

   en.wikipedia.org/wiki/Gnathostomata

   The earliest recorded acanthodian, Fanjingshania renovata, [19] comes from the lower Silurian of China and it is also the oldest jawed vertebrate with known anatomical features. [19] Coeval to Fanjingshania is the tooth-based acanthodian species Qianodus duplicis [ 20 ] that represents the oldest unequivocal toothed vertebrate.

6. Experts Say Weight Lifting Is The Fountain Of Youth. Here's ...

   www.aol.com/lifestyle/experts-weight-lifting...

   Hinge at your hips with your torso parallel to the floor or at a 45-degree angle. Focus on keeping your back flat. ... Try rotating between upper body, lower body, and core exercises to keep ...

7. Derrick - Wikipedia

   en.wikipedia.org/wiki/Derrick

   A-frame derrick. An A-frame derrick is one in which the boom is hinged from a cross member between the bottom ends of two upright members spread apart at the lower ends and joined at the top; the boom point secured to the junction of the side members, and the side members are braced or guyed from this junction point.