In a population of lizards, in a 6-month period, 150 lizards emigrate from the population. In the same 6-month period, 140 lizards immigrate to the population. How
did the population change during the 6-month period? (Assume all other factors did
not change.)
A. The population decreased by 10 lizards.
B. The population increased by 140 lizards.
C. The population increased by 150 lizards
D. The population decreased by 290 lizards

Achemistry student needs to standardize a fresh solution of sodium hydroxide. he carefully weighs out of oxalic acid , a diprotic acid that can be purchased inexpensively in high purity, and dissolves it in of distilled water. the student then titrates the oxalic acid solution with his sodium hydroxide solution. when the titration reaches the equivalence point, the student finds he has used of sodium hydroxide solution.calculate the molarity of the student's sodium hydroxide solution. be sure your answer has the correct number of significant digits.