In the northern hemisphere, why is it warmer in july than january? a. the maximum solar intensity is greater in july. b. the days are longer in july. c. the northern hemisphere is tilted towards the sun in july. d. all of the above.

Pepsin is an enzyme in the stomach that breaks polypeptides into amino acids. pepsin functions best at a ph of around 1.5. what would be the most likely result if the ph of the stomach were increased to 5

Atypical human cell is approximately 12.00 μm in diameter and enclosed by a membrane that is 5.000 nm thick. (a) what is the volume of the cell including the membrane? (b) what is the volume of the cell membrane? (c) what percent of the total volume does its membrane occupy? to simplify the calculations, model the cell as a sphere. enter your answers using four significant figures.

What is the difference between an igneous, sedimentary and metamorphic rock