D. Scientists can know exactly how old a fish is. They are very interested in Thorrold's research findings. They want to know where they can find fish. They lend their fish for chemical studies. They wonder if Thorrold can find growth rings from their ears.
Some airlines offer extra frequent-flier miles for the ticketless crowd.
And there are rising punishments for paper lovers. The airlines insist that the increase in price is not meant to push travelers toward E-tickets but only covers the increasing cost of replacing and tracking a missing ticket. It is cheaper for air travelers. It helps reduce the cost for airlines. It can use computer to plan air traveling.