Answer:
About 20 kilometers
Explanation:
The biosphere is about 20 km from top to bottom. It has existed for about 3.5 billion years so it's pretty old
Answer: between about 500 meters (1,640 feet) below the ocean's surface to about 6 kilometers (3.75 miles) above sea level. The biosphere has existed for about 3.5 billion years
Explanation:
