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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 is the difference between an acid and a base? Base is anything, which has a capability to abstract a proton. Using the easiest definition, an acid is something when add
How to do Glucose test A glucose test is a type of blood test used to determine the amount of glucose in the blood. There are several different kinds of glucose tests: "
Q. What are some fungal diseases transmitted by animal feces? Pigeon and Bat feces can carry Histoplasma capsulatum, the fungus agent of histoplasmosis. The infection is transm
what''s a mature female sheep called
What STRUCTURAL features do these three organisms have in common in terms of a) excretory systems b) respiratory systems c) circulatory systems and d) nervous systems ? The species
Social Status and Support Network Income and Social Status: Higher income and social status lead to better health.Employed persons, having more control over their workin
The systems of your body are capable of performing specialized functions that keep you alive and enable you to reproduce. In a very general kind of way, a cell is also capable of p
Evolution of heart in higher animals The circulatory system in higher animals has undergone several changes during evolution. The heart has become totally muscular. Th
What is demography? The scientific study of human population is termed as 'Demography'. It focuses attention on three readily observable human phenomena: a) Changes in popul
Adaptation Closely related to irritability is the capacity of living things for adaptation. You might have noticed that whenever you go outside in the bright sun after having
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