Why can't elephants grow tusks anymore?

Why can't elephants grow tusks anymore?

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

<<:  Yu Lu丨The beauty of symmetry breaking realizes the unity of the physical world

>>:  There is a new breakthrough in the "bottleneck" technology. What is the use of "hand-torn steel" that can be torn apart easily?

Recommend

Shrimp or "monkey" is actually a "little bug" with strong survival ability.

Artemia, also known as Artemia, Artemia shrimp, a...

Product Analysis Report丨How does WeChat Reading retain users?

I have always believed that reading is a solitary...

How much of your storage capacity has WeChat and Alipay taken up? Exaggerated

Although WeChat is called Wei, it occupies 5G sto...

Can a "hole" melt an iceberg?

In 2014, American baseball player Pete Frates ini...

Deloitte: Outlook for automotive suppliers in 2025

Automotive players are facing disruptive times. I...

The world of mini programs and how to operate them

1) The world of mini programs /direct services Th...