An observer that stands still as the electron moves by him, will he observe an electric field, an electric and magnetic field, a magnetic field, or an absense of fields

Why is the theory of evolution important? it disproves all other theories about how life began. it provides a topic for debate. it is a unifying concept in biology. it explains how life began. i know for sure, it is not "it is a unifying concept in biology."

Which of the following is a testable hypotheses?

Polar zones are cold and tend to be dry because of a pressure system of cold. low high