Liquid waste is held in the bladder until the bladder sends sensory information to the brain to let the brain know that the bladder is full. The brain controls the release of this waste. This is an example of the A respiratory system working with the circulatory system. B circulatory system working with the skeletal system. C endocrine system working with the reproductive system. D nervous system working with the excretory system.

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.