Molluscs to three different aquatic biomes.

Introduction: Molluscs are one of the most diverse groups of wishy-washy fleshlys - some(prenominal) in form and habitat. Therefore the study of molluscs has captured the interest of amateurish and scientists alike for many centuries they have figured prominently in paleobiological and biological studies, and have served as study organisms in many evolutionary, biomechanical, ecological, physiological, and behavioural studies (Little, 1990) Within the phylum Mollusca, snails and slugs make up the largest molluscan group, and have so been canvas most extensively. They are so named because their foot spreads let out when the animal crawls about (Little C 1990). The cerebral ganglion of several species (e.g., Euhadra peliomorpha, genus Aplysia californica, and Lymnaea stagnalis) secretes a neurohormone that stimulates the hermaphroditic sex gland (the reproductive gland that contains both virile and female characteristics); hermaphroditism is a honey oil condition among m olluscs. This gonadotrophic peptide hormone is stored in a regular(prenominal) neurohemal organ until its incommode is stimulated. For example, phototropic information detected by the supposed optical gland can direct the release of the gonadotropic hormone. The hermaphroditic gonad of Euhadra secretes testosterone, which stimulates formation of a gland that releases a pheromone for influencing mating behaviour. The optic gland of the octopus (of the class Cephalopoda) influences tuition of the reproductive variety meat on a seasonal basis. It is not known, however, whether any neurohormones are involved or whether this is purely a neurally controlled event.

All molluscs have a similar corpse plan with three main part: *         a foot, *         a visceral hoi polloi, *         a mantle. The foot is utilise for movement, the visceral smoke contains most of the internal organs, and the mantle is a heavy congregation of tissue over the visceral mass from which a puzzle may develop. The mantle cavity is an lengthiness of the mantle, which contains the gills, the... thanks for the quiz it help me alot! i never really knew this overmuch constrict but now i do! thanks If you end to get a full essay, order it on our website: BestEssayCheap.com

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