Clubs have been in existence for hundreds of years. what was the middle english term meaning:
a) to form or gather into a mass;
b) to join or combine for a common purpose;
c) to form a club

Ascientist performs an experiment where she measures the mass of a piece of metal, pours acid onto the metal, washes the metal, and then re-measures the mass of the metal. the scientist repeats the experiment several times, each time increasing the amount of acid used. the dependent variable in the experiment is the: initial mass of the metal final mass of the metal amount of acid used washing the metal