Pollution

The impact of human activities on the earth has become noticeable and significant during the last century resulting from: Increasing …

Diffusion

Diffusion is the seemingly random movement of a substance from where these particles are in high concentration to where there …

Mitosis

Between divisions, a copy of each chromosome is made. The chromosomes then start to become visible. The centrioles separate and …

Meiosis

As meiosis begins, the chromosomes start to become visible. At this stage they have produced replicas of each other. The …