Molluscs are very soft invertabrate animals and the most abundant among invertebrates on our planet. They are divided into three smaller subgroups: the gastropods, the bivalves and the cephalopods. Read more
When we are born, there are a series of characteristics which clearly differentiate a woman's from a man’s body. These are the sexual organs. As we grow, our bodies change and it is easier to tell apart a girl from a boy Read more
The Earth is the third planet from the Sun. Like other planets in the solar system, the Earth moves in two different ways: one is called rotation and the other is called revolution. Read more
So that our body can make the most of the food we eat, it must first transform it into a simpler substance called nutrients. This food transformation process is called digestion and is done by the digestive system. Read more
