Before nitrogenous wastes are excreted in urine, they are converted first to ___ and then to ___. ...

Before nitrogenous wastes are excreted in
  urine, they are converted first to ___ and then
  to ___.
 
  a. urea--ammonia
  b. ammonia--urea
  c. glycogen--monosaccharides
  d. glycerin--fatty acids
  e. glyerin--urea

Question 2

The body mass index is used to
 
  a. determine a healthy weight based on height.
  b. calculate a person's percentage of body fat.
  c. calculate a person's percentage of muscle.
  d. determine how many calories a person
  should consume per day.
  e. determine a healthy weight based on height,
  and to determine how many calories a
  person should consume per day.