▶ Your Answer : The reading and the lecturer are both about extinction of Diprotodon. Whereas the author of the reading suggests three theories that could explain the reason of the extinction, the lecturer casts doubt on the main points made in the reading. First of all, the reading argues that a low birth rate caused the extinction. However, the lecturer disputes this point. He gives an example of Coala bear which is closely relevant to Diprotodon. He says that even though Coala bear has lower reproductive rate, they does not disappear untill now. Secondly, the reading claims that lack of food made Diprotodon extinct. On the other hand, the lecturer counters this argument. He mentions that thanks to the human activity, the nutritional values were increased. Also, saltbush which is Diprotodon's the most favoral food could be replaced by other crops. Finally, the reading asserts that Diprotodons were annihilated by predators. But the lecturer believes that this doesn't make any sense. Due to huge size of Diprotodons, there were just few predators, and they had lived with Diprotodons for a numerous years before. In conclusion, although the reading and the lecturer are both about Diproton's extiction, the three main points made in the reading are effectively challenged by the lecturer.
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