| The decrease of human brain | ||
| Thesis 总论点 | 3 possible explanations | Against． 反对 |
| Sub—point 1 分论点1 | Climate change.Small body can adjust to hottemperatures, so human brain shriks in accordance with the body. | 过去温度也在变化，但人脑持续变大，所以人脑大小和气温无关。The size of htunal brain has nothing to do with temperatures. The brain keeps getting larger and large no matter temperatures go up or fall down. |
| Sub—point 2 分论点2 | Changes of agricultural lifestyle. Smaller brain fits file diet when people start eating grain, with protein and vitmnin in it. | 有些地区最近才有生活方式的改变，但人脑变小在全球几乎是同一时间发生，所以不可能。Lifestyle appears in different times．There was no such trend in Australia and South Africa until recently. Yet the decline of human brain occurs at the sametime around the world. So this assmnption cannot be true. |
| Sub—point 3 分论点3 | Changes in hmnan muscle mass. Human muscles have shrunk. Which leads to the decline of muscle—controlling brain. |
肌肉群知识略有缩小，而人脑变小了很多，所以这不可能是主要原因。The size of human muscle mass only decrease slightly, yet brain size gets much sinailer. So this cannot be the major reason． |
