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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 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...

Test Answer

Mitochondria are advantageous as they allow the cell to respire aerobically, without them they can only respire anaerobically. As a result of this aerobic respiration due to the mitochondria's presence th...