1.the movement of particles from a less crowded area to a more crowded area requires

a. sunlight
b. energy
c. a membrane
d. osmosis

2. what structures allow small particles to cross cell membrane

a pan containing water is placed in a positio n where it is exposed to a 10 mile per hour wind. the pan contains a uniform depth of 1.27 cm of water, is quite wide, and has a length of 2.44 m in the wind direction. the water in the pan is at a constant temperature of 15.5 °c.