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biology paper 1 doubts

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i wrote ''active transport' as it takes from a lower to higher conc. so the no. of molecules at the other side would keep on increasing..n no equilibrium would establish!
But didn't the question asked which one would give an equilibrium? I think i chose osmosis, diffusion and facilitated diffusion. Active transport can't be included because it never occurs to maintain an equilibrium.
 
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According to a Cambridge past paper, prokaryotes are 75 nm! Btw 75 nm is equal to 0.075 micrometres, not 0.75 micrometres.
 
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