Through the process of simple diffusion, materials move across a cell membrane

a.

from an area of higher concentration to an area of lower concentration.

b.

from an area of lower concentration to an area of higher concentration.

c.

between areas of equal concentration.

d.

all of these

i need this

Two solutions of the same uv-absorbing molecule were analyzed by uv-vis spectroscopy on the same instrument using 1 cm pathlength cells. use data from the table to calculate by what percentage the concentration of solution b is compared to that of solution a.sample absorbance at 315nm a 0.45 b 0.80