Passive Transport: Simple Diffusion
Diffusion across a cell membrane is a type of passive transport, or transport across the cell membrane that does not require energy. Remember that the cell membrane is a phospholipid bilayer. Although the inside and the outside of a cell are both water-based, there is a hydrophobic region in the middle, and this is an important barrier to anything large, charged, or hydrophilic. Molecules that are hydrophobic, just like the hydrophobic region, can pass through the cell membrane by simple diffusion.
Therefore, simple diffusion is the unassisted passage of small, hydrophobic, nonpolar molecules from a higher concentration to a lower concentration. Very small molecules can slip through the cell membrane, too, even if they are hydrophilic - just like a few ants might crawl through a crack in the wall just because they're tiny.
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pollution doesn't nessairly stay in the atmosphere, it is moved throughout the atmosphere and can be removed by a natural process.
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the correct answer would be
A. atoms, molecules, cells, tissues, organs
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Natural product should be encouraged against chemicals this include vinegar, citric acid from citrus fruits and bicarbonate of soda.
The use of right lightbulbs helps conserve energy at home.
A recycle bin makes the environment more confortable as it helps recyle some waste product such as paper, bottles, jar .
Schools should use fluids, non toxic chemicals that are environmental friendly for cleaning in the school
The use of plastic should be reduced in lunchroom to make the environment condusive and less of plastic waste
The schools should plant trees in the environment to encourage fresh air ansd allow for carbon fixation.
