****** THE UNIQUE EARTH******
*unlike the other planets of our solar system, life developed into many forms on the Earth after its emergence. liquid water and oxygen for breathing made this possible, Millions of species of plants and animals thrive today on land and in water. water covers more than two-thirds of the earths surface. Therefore,the earth appears blue from the moon of from the international space station..for this reason , it is also call a "blue planet"