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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".
Q. What is the difference between primary ecological succession and secondary ecological succession? The Primary ecological succession is the changing sequence of communities f
How Primarily Energy Deficiency cause PEM? Surveys on preschool children in different parts of the country reveal that PEM is primarily due to dietary energy deficiency arising
Compare the teeth of Australopithecus afaensis and Homo sapiens. a)Describe the similarities and differences between the two species. b) Write a hypothesis about dietary difference
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why the excretory organ of prawn is called ''green gland''?
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Theories are import because they can be used to a. Test research hypothesis b. Develop questions which will facilitate more effective research c. Conduct more meaningful and useful
Define the terms umbra and penumbra, and describe how they relate to solar eclipses.
In an ecosystem various trophic levels are interlinked with each through a food chain. ( the transfer of food energy from green plants through a series of organism with repeated ea
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