According to fossil evidence,Tiktaalik either crawled or paddled in shallow,tropical streams,approximately 380 mya.These streams may have occasionally become anaerobic,but fossil structures in Tiktaalik indicate it could have what adaptation or selective advantage in these conditions?

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Tiktaalik's ability to lift and support its head allowed it to breathe air with its lungs, giving it an advantage in shallow streams that may have occasionally become anaerobic. This adaptation allowed it to survive in environments where other aquatic animals may not have been able to survive.

According to Fossil Evidence,Tiktaalik Either Crawled or Paddled in Shallow,tropical