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Species that live in desert habitats, where water is scarce, have adaptations to conserve water and cope with the sandy terrain. A good example is the cactus which has thin spines intead of leaves, this r...

Unlike mammals fish have water as their gas exchange medium instead of air. Fish use gills for gas exchange, gills are specialised flaps of tissue which have the following features to allow efficient gas ...

Mitosis Human cells have 23 pairs of chromosomes (diploid - 2 copies of each chromosomes). This is a form of cell devision which makes an exact replica of the cell that is dividing. The cell grows ...

• basic anatomy of the heart: chambers, valves, structural difference between right and left side of the heart
  
• pulmonary vs. systemic circulation
  
• blood flow through the h...

Mutation Competition Females are attracted to the tail Reproduce with males with an extravagant tail Offspring pass on the characteristic of an extravagant ...