Are black bears and white bears the same species? why or why not?

Answer 1

Do you mean polar bear?

A definiton of species is that they do not interbreed. There is an example of a brown/polar bear cross.

http://news.bbc.co.uk/1/hi/sci/tech/4766217.stm

I believe brown and polar bears are closely related. Not sure how close related black and polar bears may be.