Which of the following is a correct difference between active transport and facilitated diffusion?
-active transport can move solutes in either direction across a membrane, but facilitated diffusion can only move in one direction.
-active transport involves transport proteins, and facilitated diffusion does not.
-facilitated diffusion can move solutes against a concentration gradient, and active transport cannot.
-facilitated diffusion involves transport proteins, and active transport does not.
-active transport requires energy from atp, and facilitated diffusion does not.

Active transport requires energy from ATP while facilitated diffusion does not

Explanation:

Active transport and facilitated diffusion with the use of channel and carrier proteins are both ways by which ions, polar and large molecules cross a selectively permeable membrane.

The major difference is that; Active transport transport these particles from a low to high concentration, which is against concentration gradient and hence, energy is required to perform the task

Facilitated diffusion transport from a high to low concentration, which is through a concentration gradient and hence, no energy is required to perform the task.

answer: ice crystals in air

the water from the water body or another source of water gets evaporated as water vapor as an effect of heat on water. these water vapor rises in the upper layers of the earth atmosphere under high atmospheric pressure. the atmospheric pressure of these water molecules starts to decrease due to the effect of cold air. the invisible water vapor condenses into visible water droplets and ice crystals.these ice crystals and water droplets being less denser than the surrounding air floats on air as clouds.