Why is empirical evidence used to support scientific explanations?

Someone me with this: a mineral' is determined by its actomic structure.

Anurse is preparing to administer ampicillin 500 mg in 50 ml of dextrose 5% in water (d5w) to infuse over 15 min. the drop factor of the manual iv tubing is 10 gtt/ml. the nurse should set the manual iv infusion to deliver how many gtt/min? (round the answer to the nearest whole number. use a leading zero if it applies. do not use a trailing zero.)

Fungi are classified into how many groups? a. 1 group b. 2 groups c. 3 groups d. 4 groups