Adrain cleaner consists of sodium hydroxide and aluminum. when the drain cleaner is added to water, bubbles of hydrogen are produced, and the solution becomes very hot. which of these best describes what happens when the cleaner is added to water?

a. an endothermic chemical reaction
b. an exothermic chemical reaction
c. an endothermic physical reaction
d. an exothermic physical reaction

Suppose that on a small island off the coast of scotland, 32 percent of the population has blue eyes, which means that these individuals must be homozygous for the blue eye color gene (bb). the only other eye color found on the island is brown, and individuals that are homozygous for the brown eye color gene (bb) or heterozygous (bb) will have brown eyes because brown is the dominant gene. assume this population is in hardy-weinberg equilibrium. if 100 babies are born next year, how many of these would you expect to have brown eyes and be heterozygous? a. 58 b. 49 c. 29 d. 43