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In earthworms, when the ovaries mature, the clitellum secretes a viscous substance in the form of a girdle. This girdle hardens in to a cocoon around the clitellum. The ova are discharged into cocoon. When this cocoon moves over the spermathecae openings, the sperms which are already collected from another worm and stored in the spermathecae are discharged into the cocoon. The cocoon finally, comes out of the body and fertilization takes place in the cocoon. As it is taking place outside the body, it is called as "external fertilization".
Define Placental secretion of oestrogens During pregnancy? Placental secretion of oestrogens increase with progression of pregnancy. Oestrogens perform many functions. They sti
Define Nutritional Support Management for chemotherapy? Antiemetics are used in the treatment of chemotherapy induced nausea and vomiting. Antiemetics become absolutely necessa
Equal Distribution of Hereditary Material: In mitosis the heredity material is equally distributed in the daughter cell. 2.No Change in Genetic Information: As there is no
These circular orifices are located at the upper ends of the outflow parts of the left and right ventricles respectively. The pulmonary orifice which is 3 cms, is 0.5 cm larger tha
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differences of plants and animals in terms of form and structure?
Why is the skin on worms, the gills in fish, and the lungs in humans good epithelial surfaces for respiration. Be specific.
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