Natural Selection 2

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   alleles      characteristics      die      disease      environment      generation      genes      natural      offspring      survive      variation   
There is a wide range of within particular species because of difference in their . Predation, and competition (often for food) cause large numbers of individuals to . Individuals that are those that are most suited to their . Those individuals that survive pass on their (and therefore their characteristics) to their . This process is known as selection.
Natural selection can alter the frequency of particular in a population. Alleles determining favourable increase in frequency. This is because alleles which enable individuals to survive are passed on to the next .