Question

fill in the blanks 3. About So,ooo years ago, _____ came into existence ​

Answer 1

Answer:

This figure shows concentrations of carbon dioxide in the atmosphere from hundreds of thousands of years ago through 2019, measured in parts per million (ppm). The data come from a variety of historical ice core studies and recent air monitoring sites around the world. Each line represents a different data source.

Data source: Compilation of eight underlying datasets5