Both the passage and the lecture discuss the function of the appendix in human body. The passage claims that appendix is used in human to aid with digestion in the past. However, the lecture argues that appendix maintains good bacteria in human.

 

First, the passage states that considerable portion of human diet relied on foliage in the past, and appendix helped human to digest rough leaves. It says that once the diet of human changed due to evolution, the appendix began to shrink. On the other hand, the lecture disagrees. He says that location of appendix is key evidence of his statement. The lecture says that it is the safest place for good bacteria until the bad bacteria is flushed away.

 Second, the passage supports its idea by mentioning the size of the appendix in other animals that consumes a large amount of leaves. The passage gave an example of koalas, of which their diet only made out of leaves. It states they have larger appendixes than humans because of their diet. Again, the lecture refutes about this by claiming that it is a coincidence that koalas have large appendixes. He says although koalas have large appendixes, but panda bears, which also eat a lot of leaves don’t have one in their bodies.