The absence of in the primitive atmosphere was essential to the origin of life on earth. n2 co2 ch4 o2

Which phrase best describes surface currents? 1. up-and-down ocean movement caused by wind 2. waves that hit the shore at an angle and transport sand 3. streams of warm water flowing through the ocean and caused by wind 4. waves that approach the shore and cause their crests to fall into their troughs

How can you keep track of variables in a science experiment?

What role do traits play in affecting an organisms ability to reproduce? finches