Simple Diffusion Across the Cell (Plasma) Membrane. The structure of the lipid bi-layer allows small, uncharged substances such as oxygen and carbon dioxide, and hydrophobic molecules such as lipids, to pass through the cell membrane, down their concentration gradient, by simple diffusion.
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Jatropha<span> plant seeds which are very rich in oil</span>
When an object reflects all light, you will see white light.
The growth or tuning of plant root toward or away from moisture
<span>Plants use energy from sunlight to turn water and carbon dioxide into an energy-rich sugar called glucose. </span>
