What do you mean by passive transport

Passive transport doesn't require any energy input. For example: difusion.

Passive transport moves molecules and ions from a higher concentration to lower concentration without any energy.

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Explanation:

Passive transport is a type of membrane transport that does not require energy to move substances across cell membranes.

the earths atmosphere is made up of nitrogen and oxygen. solids can turn into gasses through a process called sublimation. sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.

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resonant frequency