Evolution results in the formation of new species from pre-existing species over time.
Define the term evolution.
In order for speciation to occur, the different populations must be reproductively isolated from each other.
One way in which populations may become reproductively isolated is by ecological separation.
Give two examples of ecological barriers that may exist between populations.
Allopatric and sympatric speciation both result in the formation of new species.
State the key difference between them.
Sympatric speciation can occur when certain behavioural barriers result in the reproductive isolation of populations.
Suggest one behavioural barrier and explain how it may result in reproductive isolation.
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