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A- A Concentration Gradient

B- A Selectively Permeable Membrane

C- A Source of Energy

D- A Protein

The Answer Is (A)

Diffusion can occur without a semipermeable membrane, as diffusion is simply movement of a substance from high to low concentration. A source of energy is needed only for active transport. Proteins are needed if the the particles transported are too big to pass the semipermeable membrane.

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13y ago

concentration gradient

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10y ago

why it is neccesary

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Q: What is essential for diffusion?
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Why do cells use the process of diffusion?

Diffusion is essential for cells to bring nutrients and releasing wastes without spending energy.


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Because without them, your nipples would not produce mountain dew.


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What is the diffusion problem how is it solved in eukaryotic cells?

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How is diffusion different from osmosis?

The essential idea is the same: diffusion is the process by which molecules spread from areas of high concentratiion, to areas of low concentration. Osmosis is the process by which molecules of WATER spread from areas of high concentration (such as a dilute solution) to areas of low concentration (such as a concentrated solution), typically through a selectively permeable membrane. In short: Diffusion occurs as is, while osmosis occurs through a semi permeable membrane.


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How the leaf adapted to perform phtotsynthesis?

Leaves have large surface areas to absorb as much light as possible, and are thin for rapid diffusion; also, they contain chlorophyll, essential for photosynthesis.


Diffusion of AIDS is an example of which type of diffusion?

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