Biology: Coelomates

Coelomates: Animals with Internal Body Cavities | Back to Top Coelomates be fleshlys that take for innate organic structure cavities, or  celomas. Humans are coelomates, we have an abdomenal cavum (digestive variety meat, some of the excretory and reproductive organs) and a thoracic cavum (heart and lungs). Coelomates besides form a flesh of interior and impertinent skeletons. External skeletons and coeloms appeared during the Welsh-Ordovician time, as shown in picture 1. These skeletons offered several advantages to their producers: 1. secretion of a mineral pound that allowed the animal to use the shell as a mineral repository. 2. shelter from drying out in the intertidal zone during low tides. 3. resistance from predators. 4. Sites for anchoring muscle alliances, go new patterns of locomotion and increased strength. public figure 1. First appearances and sexual relation diversity (width of shaded area) for major groups of animals.  p icture show from Purves et al., Life: The Science of Biology, quaternate Edition, by Sinauer Associates (www.sinauer.com) and WH Freeman (www.whfreeman.com), expend with permission.| | Phylum phylum Mollusca: Clams, Scallops, and Squids | Back to Top The phylum Mollusca contains over 100,000 species with a variety of body forms and lifestyles.

In mollusks, the coelom is reduced and restrain to the sphere around the heart. The Mollusk body first appeared during the Cambrian Period. All mollusks have: 1. a nonrational mass containing internal organs, including the digestive tract, paired kidneys, and reproductive organs. 2. a mantle tha! t surrounds merely does not cover entirely the splanchnic mass and secretes a shell (if one is present). The mantle also contributes to formation of gills or lungs. 3. a head/foot region containing sensory organs and a muscular structure (foot) used for locomotion. The foot is a muscular structure used for locomotion, attachment to a substrate, intellectual nourishment capture, or a combination of functions. 4. A radula is an organ that...If you exigency to get a full essay, coiffe it on our website: OrderCustomPaper.com

If you want to get a full essay, visit our page: write my paper