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Variation in the population occurs through mutations. Some organisms have advantages that allow them to survive the selective pressure (thus could be Food shortage or predators) Survivors reproduce and pa...

Features/organelles present in both animal and plant cells include: the nucleus (where the DNA/genetic information is stored - this controls the activities of the cell), the cell membrane (a thin containi...

Epithelial tissue lines the inner surface of the stomach and provides protection. Glandular tissue produces enzymes such as proteases which can digest and break down proteins, it also secretes acid which ...

'Coronary' refers to heart, and coronary arteries supply heart muscle cells with blood. Firstly consider why we need to transport blood around the body? Blood carries many essential nutrients and componen...

The case of the emergence of a new shade within the species is an example of Evolution by Natural Selection. Moths use the colour of their wings as camouflage against pre...