Sympatric speciation, biology homework help

Summarize the following three methods that could produce a new species from an existing species and provide examples, in 500-650 words. Include a summary and specific examples:
** (my advice is to make each of these a separate section in your paper, easily organized and you won’t forget any of them!)

Allopatric speciation
Sympatric speciation
Polyploidy

Include at least three references.
Format your paper consistent with APA guidelines.