What is the purpose of this kind of map?

(it is a picture of hebrew migration)

to explain what natural resources were available

to show where humans moved and settled

to show why humans had to move around the world

to explain that global migration was very dangerous

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