In the 6th Century who found out that Earth was flat

As our current atmosphere formed, the concentrations of various atmospheric gases fluctuated. match each gas with the explanation that best describes how its proportion changed during the evolution of the atmosphere.

What caused the american indians to relocate in the late 1600’s,

Amedical school hires a consultant to meet with congressional staff to advocate federal funding for the medical school's research on breast cancer. this is an example of