. Trachea is surrounded by 16-20 rings of hyaline cartilage.
1. America
2. Asia
3. Africa
4. Australia
Best Answer
Ans: 3
Sol: First human evolution took place in Africa. Humans first evolved in Africa, and much of human evolution occurred on that continent. The fossils of early humans who lived between 6 and 2 million years ago come entirely from Africa.
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