Figuer:
-Tiktaalik either crawled or paddled in shallow tropical streams about 380 MYA,during the late Devonian period.These shallow waters often became anaerobic.What selective advantage would Tiktaalik have under these conditions?

Question

Figuer: 
-Tiktaalik either crawled or paddled in shallow tropical streams about 380 MYA,during the late Devonian period.These shallow waters often became anaerobic.What selective advantage would Tiktaalik have under these conditions?

Quizplus · Accepted Answer

Tiktaalik would have a selective advantage if it could lift its head out of the water and breathe air through its lungs, providing it with an additional source of oxygen when the shallow waters became anaerobic. This adaptation would allow it to survive in low-oxygen environments that would be lethal to other fish that were solely dependent on gills for respiration.

Figuer: -Tiktaalik Either Crawled or Paddled in Shallow Tropical Streams About