1. Because there were no roads back then!
2. Because he likes to show off and smile a lot.
3. First you take the sloth over, leaving behind the smilodon and the branch. You come back and bring the smilodon over. You then bring the giant sloth back over to the first side. Then bring the branch over leaving the giant sloth on that side. You come back and finally bring over the giant sloth.
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