mammoth to the passenger piejen.lp bringing species back may fix pastqw3 mistakes and fix endangd anv(sáip imaginations. 6u( a million years after extension, there's no chance scientists can bringçó dinosaur back says the biologist. ñ a fantasy q will be. dinosaurs are way too old to think we're going to recoverxd genetic material. >> scientists areó[ focussingl species thatlp went extent more recently. researchersñr have revived one animal, the last of a type of mountain goat that was cloned in spain inñr 2003. the clone only lived a few minutes. here in thenu.s., george churc from harvard medical school is engineering elephant cells with thicker hair and a fatty layer to make them look mammoths. his goal is to keep the arctic from growing. scientists feel mammoths strengthens the grass that grew on top of the frost and protected it from the sun.çó >>lp mammoths may have had a bi role in maintaining the grasslp thate1 stabilizq> the same engineering technology could one day