Which of the following is an advantage of seasonal changes in fur color? (A) It makes hares less likely to be eaten by predators.
(B) It makes hares better able to see each other to find mates.
(C) It makes the biodiversity of the ecosystem greater.
(D) It makes hares better able to respond to climate change.

Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)