Which of the following best describes how humans most often depend on forests to meet our needs? a. we depend on them to provide food through agriculture. b. we depend on them to supply the fuel needed to operate vehicles. c. we depend on them to supply the minerals and ores that we use in trade. d. we depend on them to provide the materials we need to build houses for shelter.

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