Question

powers: the scientific method: what is science? how do i ...
the scientific method: what is science? how do i do my own experime...
does it dissolve in water?
multiple - choice question
what was the independent variable (what changed) in the dissolving experiment?
the solids put into the water
the amount of water
shaking for 60 seconds
whether they dissolved or not

Explanation:

In an experiment, the independent variable is the factor that is deliberately changed. Here, different solids (flour, pepper, salt, gelatin, sugar) are put into water, so this is what is being changed. The amount of water and shaking time are likely kept constant, and whether they dissolve is the dependent variable.

Answer:

the solids put into the water