Alfonso is conducting an experiment to determine whether temperature affects how fast earthworms move. what are the dependent and independent variables in his experiment?

In Alfonso's experiment, the speed by which earthworms move is his dependent variable while his independent variable are the degrees of temperature. 

He will be changing the degrees of temperature to see how this will affect the speed by which earthworms will be moving. 

It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).