what did lungs and gills evolve from,and what did evolve from them?

Question

I need to know briefly evolutional path of lungs and gills,and what might have developed from them,if you have pictures that is even better thanks

Answer 1

Hi. Both were required to extract oxygen from the surrounding environment. Water flowing over gills did not work for animals trapped in a tidal pool because more surface area is required. Gills with more convoluted shapes would have a survival advantage and eventually evolved into primitive lungs. These would get more efficient as time went by. The apple snail has both gills and lungs http://www.applesnail.net/ This site is only 1 of 5 that Google picked up with "lung/gill combination". http://www.msnbc.msn.com/id/3077405/

Answer 2

the foetus of many creatures, mamalian, avian, and amphibian, all resemble each other so closely that it can be very difficult to determine what it is at an early stage. the lungs of a human arise from a germ layer known as the mesoderm. interestingly, the part of an embryo that develops into the ears of a human, is the part that gives rise to the gills of fish.

Answer 3

All in the gene!