Determination of sea depth and fish shoals by echo
Determination of sea depth and fish shoals The sonar device is used on the ships to find the position of the sea bed, It is used to detect the sunken wrecks or the submarines...
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The structure of the sperm in the male reproductive system
The sperms The testes of the adult human male produce about 2 billion sperms per day , the lifetime of a single sperm inside the female vagina ranges from 2 to 6 hours, this...
The boiling point and separation of the petroleum oil
The boiling point The boiling point is the temperature at which a matter begins to change from a liquid state to a gaseous state, The change of matter from the liquid state to the...
Structure and function of the ovum in the female reproductive system
The ovum (the egg cell) is the female reproductive cell in the female reproductive system, It is large (as sesame seed size) due to the storage of the nutrient materials.