unit 4 study guide questions?

1. Automobiles that use more than one source of power are called ______________. (Points: 1)        2. Harnessing this energy, ___________   __________  can only be done currently at a few shorelines on the Earth. (2 words) (Points: 1)        3. Fine sedimentary rock… Continue Reading

The earliest traces of life on earth?

Please help I really need to know these, ten points for whoever can answer all correctly The Earliest Traces of Life 1. When do scientists think life originated on Earth? 2. What are the oldest fossils and how old are… Continue Reading