including drastic drops in temperatures. While these colder periods proved fatal for many dinosaurs, crocodiles had the adaptive ability to enter a state of dormancy during cold spells. Finding refuge in safe hideouts, they would simply re-emerge once the conditions became more favorable. This phys...
1 In pairs discuss the possible reasons for the disappearance of dinosaurs. Think about what is mentioned in the text,and any other reasons there may be.2 Before listening to the dodo's story, try to predict in pairs how it might have become extinct.3 Listen to the tape and choose the...
Elaborate and explain why Kim Marie Orchid became extinct in the wild. Why is it important to maintain biodiversity in ecosystems? What is prohibiting humans from doing so? Explain why increased use of biofuels in automobiles has resulted in food shortages in many countries. An abrupt drop in...
The process ofpermineralization, where mineral deposits form internal casts of organisms, provides us with a vast quantity of fossils that give us an idea of the different forms life has taken in the past. Fossils of Extinct Species A collection of skeletons mounted in museums of various dinosa...
However, scientists have tried to clone species that became extinct more recently, using DNA from well-preserved tissue samples. To clone or not to clone: that is the question. The prospect of cloning humans is highly controversial and raises a number of ethical, legal and social challenges tha...