讨论一种鲸鱼的角的用途(Narwhal Tusk)
The function of tusk cannot be simply explained by these three theories.
1、It is impossible to penetrate ice sheets because they are 750px thick. The phenomenon that reading mentioned might be caused because those ice sheets have broken before.
2、The misunderstanding in reading caused by distant observation, while close observing indicates that it is gentle communication.
3、The phenomenon described in reading passage cannot explain the female Narwhal lives longer, but few fe
Three theories to explain what the tusk for.
1、Narwhal lives in Arctic Ocean, where many ice sheets floating there. They need to pierce these ice sheets with their tusks for breathing fresh air.
2、Narwhals’ tusks are the tools that help the male Narwhal to fight with others to win its mate.
3、Millions of microscopic pores on tusks are used as sensors to detect the ocean environment.