TPO4 综合写作 恒温动物 求狠批！！

misslxx

我综合写作是fair, 但是独立写作是good, 求指点我问题在哪啊？

In the passage, it is claimed thatdinosaurs are endotherms mainly for three theories. While the lecturer arguesthat these three reasons cannot prove that dinosaurs are endotherms.

Firstly, dinosaurs can live in PolarRegions even if they are not endotherms. The lecturer argues that Polar Regionswere warmer than it is today, other kinds of animals which could not maintain asteady body temperature could survive there. Also, even during cold months in PolarRegions, dinosaurs could migrate or hibernate to deal with cold climate.Therefore, the polar theory in the passage may be invalid in the lecturer'sopinion.

Secondly, dinosaurs' legs are underneaththeir body because legs can hold more weight and larger body size. So dinosaurs'legs position may not aim at sustaining physical activities, which is thecharacteristic of endotherms. In this way, the lecturer argues that dinosaurscan not be considered as endotherms merely based on their leg positions, whichcontradicts the theory in the passage.  

Thirdly, even dinosaurs do have Haversiancanals, they are not endotherms. The lecturer told us that dinosaurs' growthrings had slower grow period when the climate was cooler and had quicker growperiod when it was warmer, which was different from endotherms' constant growthrate no matter what the climate was like as it is stated in the passage.