27. Explain how the evolution of photosynthetic organisms, such as algae, decreased the carbon dioxide and increased the oxygen of earth's early atmosphere.

Scientific thinking: what clues about biology might road kill provide?

When in solution, a molecule that moves slowly across an artificial membrane moves rapidly across a plasma membrane. this molecule rapidly enters the cell regardless of whether its concentration is higher inside or outside the cell. using this information, which transport mechanism is most likely to be responsible for the movement of the molecule across a plasma membrane? view available hint(s)when in solution, a molecule that moves slowly across an artificial membrane moves rapidly across a plasma membrane. this molecule rapidly enters the cell regardless of whether its concentration is higher inside or outside the cell. using this information, which transport mechanism is most likely to be responsible for the movement of the molecule across a plasma membrane? active transportexocytosis

Where is most of the fresh water on earth found a in the ocean b in glaciers and in ice caps c in rivers d in the soil