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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".
what are the classfication and members af phylum protozoa
What are some ways that humans can reduce the effect they have on the phosphorus cycle?
Why would we evolve so that when we are stressed our immune system is suppressed? How would this increase survival?
Bacterial artificial chromosome (BAC) is a chromosome-like structure, made by genetic engineering. BAC is a cloning vector able to carrying between 100 and 300 kilo bases of targe
Define Lipids - Tests for Presence of Exoenzymatic Activity? Lipids are also high molecular weight compounds. Enzyme lipases (esterases) cleaves the ester bond to form glycerol
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