of individual sperm and eggs may be released at one time. Fertilization takes place when sperm and egg come contact each other while floating freely in the water. Some echinoderms brood their eggs‚ especially in cold water species where planktonic larvae might not be able
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young. The typical protonymphon larva is most common and they are free living larva and gradually turns into an adult sea spider. Not much is currently known on development on the atypical protonymphon larva. the adults are free living‚ while the larvae and Juveniles are living in or on a temporary host. When the attaching larva hatches it still looks like an embryo‚ and immediately attaches itself to the ovigerous legs of the father‚ where
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Sharks are a group of fish characterized by a cartilaginous skeleton‚ five to seven gill slits on the sides of the head‚ andpectoral fins that are not fused to the head. Modern sharks are classified within the clade Selachimorpha (or Selachii) and are the sister group to the rays. However‚ the term "shark" has also been used for extinct members of the subclassElasmobranchii outside the Selachimorpha‚ such as Cladoselache and Xenacanthus. Under this broader definition‚ the earliest known sharks
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research is that it could be RECOVERY OF THE FOUR BIG-RIVER FISHES OF THE UPPER COLORADO RIVER BASIN 12 possible to remove nonnatives just prior to the arrival of drifting native larvae. This information coupled with the effects of temperatures on growth identified by Bestgen (2008)‚ could allow native larvae to reach sizes where they will be safe from predation and thus survive at higher rates. In other areas of the basin‚ Utah Division of Wildlife Resources (2010) biologists‚ found the
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personality. Worker bees are females‚ they do most of the work around the hive. From birth to 45 days later‚ the worker bee is given different tasks to do during different stages of her life. Worker bees are responsible for everything from feeding the larvae (the baby bees) to even tending to the queen‚ and also cleaning the hive‚ to collecting the food‚ they also guard the colony‚ to building the honeycomb. The stinger of the worker bee is barbed‚ when she is forced to defend the hive her stinger will
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grow very fast and shades out or coral and other seaweed. They also wash ashore making the beach smelly wich atracts more flies and less people. The Biting Fly is a fly that attacks humans and animals. They are small and carry many different diseases. If biten they can inject there larvae into you casusing infection. They are a threat to our vegetation‚ animals and ourselfes. They can easily “hitch hike” onto plants and cargo boats without being seen because of there small size. Freshwater stream fish are a very common invasive species
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Trichinella spiralis infection mostly result when a person use the infected meat of animals and it is the main cause of potential lethal trichinosis‚ central nervous system disease and pneumonitis.2% of the people in United State are diseased. Whipworm‚ Trichuris Trichiura Infection is caused when a person eat infested and unhygienic food. Mature whipworm live in the intestine of human beings and larva penetrates the wall of the gut and then it enter into the muscles resulting cysts which even cause
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mosquito bites. Mosquitos are the main carriers of the filarial worm that carries the infection. Some symptoms of this are fever‚ thickening skin‚ pain in lymph nodes‚ and swelling of lymph nodes. “Current drugs for elephantitis can kill the worm larvae‚ or micro-filariae‚ but have no affect on the adult worms.” (Blog Spot) “In tropical and subtropical areas where lymphatic filariasis is well-established‚ the prevalence of infection is continuing to increase.” (What
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Evolution of Facultative Paedomorphosis in Newts and Salamanders (Caudata) INTRODUCTION Evolution is the ultimate result of a number of influences which either promote or limit change. Ontogenesis‚ or the development of a new organism can arise from small changes in genes that induce phenotypic variation. A vertebrate usually experiences three different events during its life‚ birth‚ metamorphosis‚ and puberty. These three typically occur in order and any deviation in this cycle results in heterochrony
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survival rate dependency on income level‚ awareness‚ access to hospitals . Humans are the major hosts of the dengue virus and Aedes aegypti mosquitoes represent the principal vector .A aegypti is closely associated with human habitation and its larvae are often found in artificial water containers such as discarded tires‚ buckets and water storage facilities. Dengue is a mosquito borne disease that has recently become a public health concern. The WHO has estimated that 40% of the world’s population
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