Why can't elephants grow tusks anymore?
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Vocabulary reproduce disappear proportion weed out rhino civil war poaching Trend (tendency) Ecological chain (ecological chain) fertilized egg main current African elephant evolution Character Dominant gene Sex chromosome rampant shark fin (fin) greed (greed) academic paper Female (female) ecological environment (ecological environment) Column consultant/ Dr. Zhang Dake, associate researcher at the Center for Advanced Biomedical Engineering, Beihang University Guest: Tao Yong, Director of Ophthalmology Department, Beijing Chaoyang Hospital Produced by/ Ke Rongyi, supervised by/ He Na, coordinated by/ Wang Xiaoying Chief writer: Zhang Zhouxiang Drawing: Vasili Intern: Duan Jiayu Source: Tutu is the way |
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