The molecule that could diffuse across the plasma membrane is methane (CH4).
<h3>What is diffusion?</h3>
Diffusion is the movement of fluids or substances from regions of high concentration toward regions of lower concentration.
The plasma membrane is the semipermeable membrane that surrounds the cytoplasm of a cell. The semipermeability means that it allows some molecules through but blocks other substances.
The semipermeable plasma membrane readily allows the passage of small hydrophobic and polar molecules.
Therefore, the molecule that could diffuse across the plasma membrane is methane (CH4).
Learn more about semipermeability at: brainly.com/question/1652796
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Not exactly sure of the question your asking.
diabetes insipidus (more commonly known simply as diabetes)
Defined:
The pancreas fails to produce the correct amount of insulin which is needed to control the amount of glucose, or sugar needed in the blood.
Diabetes mellitus: a rare condition & more importantly has nothing do do with the pancreas or blood sugar.