The fertilization process in the human The fertilization is the fusion of the nucleus of male gamete (the sperm) with the nucleus of the female gamete (the ovum) to form the zygote (the fertilized...
Hardness of materials Some solid substances are soft at room temperature such as the rubber, and some solid substances need heat to become soft and easy to be shaped such as the metals, and...
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...
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...
