How many grams of urea (non volatile, non electrolyte) must be added to 1250. g water to give a solution with a vapor pressure lowering of 1.39 mm Hg at 40.0 degree C? Water pressure is 55.32 mm Hg at this temp. Urea is (NH 2) 2CO.

Explain how sequences of amino acids in proteins can be used to reveal relationships among organisms.

Ivan is looking at a cross section of a stem taken from a vascular plant. he sees two different types of vascular tissue: the xylem, which is closer to the center of the stem, and the phloem, located around the xylem, closer to the outside of the stem. how do these two structures work together in a living plant?

Read the scenario below and answer the question that follows. hallie is reading a novel in the library when susan, her best friend, slumps down in a chair next to her. susan doesn't say anything, but hallie knows that susan is upset because she is slumping in her seat and rolling her eyes. a psychologist would explain that hallie is interpreting her friend's emotion based on a. the behavioral component of emotion b. her friend's ability to regulate emotion c. the verbal component of emotion d. the physiological component of emotion select the best answer from the choices provided a b c d