Four liquids were poured on top of each other in a glass, and the liquids separated into four different layers. Which liquid had the highest density? A. the layer at the top of the glass B. the layer at the bottom of the glass C. the third layer from the bottom of the glass D. the second layer from the bottom of the glass

The answer is B

Explanation:

More dense liquids will want to flow further down. They have a higher weight per volume, allowing them to "Push past" the other liquids. Italian Dressing is a great example (when given time, the oil will be at the top because it is less dense then the water and other seasonings.

the backbone of the dna and rna compound is sugar phosphate.

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.