In which of the following eons did the greatest variety of living things exist on earth? a. hadean b. archean c. proterozoic

Based on what you know about the location of the earth in relation to the sun, why is this called the goldilocks zone in other galaxies?

The oil and gas found in the middle east are regulated by a. organization of petroleum exporting countries b. southwestern asian oil refineries c. north atlantic treaty organization

What are some natural resources found in midwest