Yes it is true, that when a solute and solvent are equal on both sides of the membrane it has achieved an osmotic equilibrium. Osmosis refers to the spontaneous movement of solvent molecules through a semi-permeable membrane. Usually the movement is that the solvent moves from a higher solute concentration into a direction that it tends to equalize both solute concentrations on both sides.
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they are all heterotrophic
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The sand will absorb more energy. This is because it is a solid, and more of a conductor of heat. Water on the other hand is not a conducter of heat, You can observe that even more when temperatures are equal.
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