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Natural selection is a theory devised by Charles Dickens. Due to the existent of alleles and genetic variation, some organisms will be better adapted for survival in their given habitat. As a result of th...

The alveoli are highly folded in order to increase the surface area available for gas exchange. The thins walls of the alveoli and the supplying capillaries allow for a short diffusion distance, thus incr...

Both mitosis and meiosis are processes of dividing a diploid cell, however there are a number of key differences. Mitosis results in two genetically identical, diploid, daughter cells and takes place duri...

Physical barriers:

• skin to prevent entry of organisms into the bloodstream

• cilia lining the nasal passages / bronchi to prevent entry to lungs / remove mucus 

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Homeostasis