DNA
DNA can be found in card packs. You can get a free pack every six hours. Tap on your DNA total at the top of the main screen, then tap the green "GET IT FREE" button to watch an advertising video to get some DNA in return. Note: This can only be done a few times per day. DNA is rewarded at the end of certain missions. Sell unwanted dinosaurs. Although you will not get as much DNA back by selling a dinosaur as spent on its purchase, you can get rid of unwanted dinosaurs for some DNA.