Which of the following describes the way substances diffuse in and out of a cell? A. Substances move from lesser to greater concentration.

B. Substances move back and forth across the membrane equally.

C. Substances move across the membrane when energy is available.

D. Substances move from greater to lesser concentration.

Answer please it would help me alot and thx

Its D. Substances move greater to lesser concentration

In simple diffusion, small noncharged molecules or lipid soluble molecules pass between the phospholipids to enter or leave the cell, moving from areas of high concentration to areas of low concentration (they move down their concentration gradient). Oxygen and carbon dioxide and most lipids enter and leave cells by simple diffusion.

Have a nice day

the answer is D.

Step-by-step explanation:

im answering so the other person can get brainliest :)

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600,000,000,000, or 6e14

step-by-step explanation:

let y equal to

the total fare and x is the mile of taxi ride. so the equation is

y = 0.55x + 1.75

since susie has

$10 to spend for a taxi cab, so he can have

10 = 0.55x +

1.75

x = 15 miles of

taxi ride

so the system of

inequality is

10 < 0.55x +

1.75

x > 2