What happened to the greenish warbler birds as they migrated from the southern portion of their range up around the tibetan plateau?
a.) they evolved separately as they moved north and became two separate species.
b.) the original species died off, but the ones that were able to adapt to a northern climate evolved into a new species.
c.) as a whole the species was able to adapt to a colder climate, but no significant changes occurred.
d.) they were unable to adapt and evolve to ensure their survival and became extinct.

The greenish warbler birds evolved separately as they moved north and became two separate species.

The greenish warbler is a widespread leaf warbler with a breeding range in northeastern Europe and temperate to subtropical continental Asia. This warbler is strongly migratory and winters in India.

The correct answer between all the choices given is the first choice or letter A. I am hoping that this answer has satisfied your query and it will be able to help you in your endeavor, and if you would like, feel free to ask another question.

its a my g

Explanation:

the answer to this question is a