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When bacteria divide, random mutations in their DNA lead to differences in bacteria. Some of the bacteria will randomly develop genes that help them to survive a dose of anitbiotics (resistance). When a p...

Evolution by natural selection arises when these three properties are present in a system

• Heredity - offspring resemble their parents in discrete characteristics.

• Variat...

A cell has DNA and this makes up chromosomes, this is found in the nucleus of the cell. A chromosome cnan divide and form 2 chromatids. Mitosis and Meiosis are both ways in which cells reproduce. Mitosis ...

The World Trade Organisation's purpose is to promote the free trade of goods and services amongst its 164 member states by discouraging protectionist measures and settling trade disputes. This directly be...

The reflex arc describes a sequence of events leading to an action that takes place rapidly in response to a stimulus without having to think about it i.e. without an impulse travelling to the brain for c...