The statement that is true about Enzymes is that A) They are used up in the reactions they catalyse.
The cause behind these changes is the that the temperature is changing while it is raining, so when it drops to 32 degrees F or below, it is snow. At 32 degrees F, it is sleet, and at higher than 32 degrees, it is going to be freezing rain.
Protein channels + no energy spent + following concentration gradient = passive transport via facilitated diffusion :)
