Thread subject: :: Why is evolution such they?

Posted by Sara21392 on 22-11-2010 08:11

I'm so thanks from you,
but I want to understand that why do some evolutions separated between males and females, and they arenít similar, while in another, for example Hypoboscidae both males and females are parasite and fed from animals and similar samples, not just carnivorous, maybe both being evolution on nectar or etc.?? Why donít have a kind of evolutions?
even as ChrisR said, maybe some different between mouth-parts! :|
thank you very much