Can a fish become a mammal, of course it can, it just need... Well, evolution theory teaches us that our ancestors descended from aquatic species so it is possible. But not everything what is possible is so easy. Of course poor ones can become rich, but to do so they need to change the way of thinking and it is really hard, very few succed. To dare to take risks for a business is really hard if you know not too much about how to make that business and how should it work. I saw many who dared and very few who didn't fail in the end.

If someone knew the easy way there'd be no poor.