IGCSE Biology

Nitrogen gas in the atmosphere is turned into nitrogen compounds that a plant can use. The plant is eaten or decayed by decomposers forming...

CO2 and other greenhouse gases: CO2, Methane, water vapour 1. Released from deforestation 2. Respiration 3. Burning of fossil fuels T...

Natural selection occurs when a mutation arises in members of a species. If the mutation is beneficial to the organism, it will live long...

Occur when a gene has been copied incorrectly. This is not done on purpose and this faulty gene can be passed down through generations.

1. Prophase is when the dna begins to condense and become more visible. The nucleus has also disappeared. 2. Metaphase is when the spindle...

Meiosis occurs in the ovaries and in the testes. It is when one cell divides to produce four haploid cells i.e. gametes. A haploid cell is ...

DNA is found in the nucleus of any cell [except red blood cells which have none]. They must be able to do two things: 1. Contain instruct...