Question

hypothesis: if molecules are small enough, then they will diffuse across a semipermeable membrane because they can pass through its tiny openings. the independent variable in this experiment was, and the dependent variable was molecule size molecule color molecule speed done

Explanation:

The independent variable is what is changed in an experiment. Here, it's molecule size as it determines whether diffusion happens. The dependent variable is the result that is measured, which is whether the molecules diffuse across the semi - permeable membrane.

Answer:

Independent variable: molecule size
Dependent variable: whether molecules diffuse across the semi - permeable membrane