Diversity within species that is using sympatric speciation

Q1. A 44 year old man complaining of substernal chest pain that developed while playing flag football with kids. He is alert and oriented, but he is complaining of mild shortness of breath. About 10 minutes after sitting down to rest, his pain begins to go way. What do you do as first responder?

Q2. Can you clarify the difference between allopatric speciation and sympatric speciation? For instance, what are the underlying mechanisms that help assist a species to originate using sympatric speciation although they are not reproductively isolated like in allopatric speciation? Is a subspecies only diversity within a species that is using sympatric speciation?

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