Which never affects the moons phase?
- the moons orbit around earth.
-the moons orbit around the sun.
-the earths rotation on its axis
-the relative positions of the earth, moon, and sun

Which are forms of nitrogen that are usable by humans

How can a geological time scale best be reconstructed? a) comparing vestigial structures in living species b) comparing homologous structures in living species c) examining homologous structures in fossil remains d) examining the written records of scientists from past cultures

Which greenhouse gas is emitted when burn fossil fuels for energy? a.nitrogen b.oxygen c.carbon dioxide d.helium