3. Earth and Mercury are both inner planets in our Solar system, yet Mercury's surface has many more craters than Earth's surface. Why is Mercury so heavily cratered while Earth has evidence of very few impact craters?

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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

Why do we perceive objects as retaining their brightness under different lighting levels?

Most animal cells membranes have proteins that pump ions out of the cell and potassium ions into the cell