the four molecules of life are proteins, carbohydrates, lipids and nucleic acids. Each of the four groups is vital for every single organism on Earth. Without any of these four molecules, a cell and organism would not be able to live. All of the four molecules of life are important either structurally or functionally for cells and, in most cases, they are important in both ways.
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Energy can exist in many different forms. ... The energy associated with motion is called kinetic energy . The energy associated with position is called potential energy . Potential energy is not "stored energy". Energy can be stored in motion just as well as it can be stored in position.
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<em>the seasons in the northern hemisphere are the opposite of those in the southern hemisphere </em>