How does new species originate due to reproductive barrier?
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☢️ hi mate......
All you need to get speciation is reproductive isolation. A change in the environment, or how the environment is used may play a role in this (i.e., ecological speciation). Whether or not you consider such changes 'remarkable' depends upon your opinion. Many speciation events seem to be associated with simple host shifts (e.g., the apple maggot fly speciation simply involved a switch in host from hawthornes to apples).
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