Help me refine my hypothesis/ research question?
My research question is :What is the effect of motor oil (Mobil 1 5W-20 Advanced Full Synthetic) of on the hatch rate of Artemia?

and hypothesis: As the concentration of motor oil present in water increases, the hatch rate of Artemia decreases.

My teacher wants me to change it so that the concentrations levels of the motor oil are present in both the research question and hypothesis, so like this: What is the effect of motor oil (Mobil 1 5W-20 Advanced Full Synthetic) at concentration levels of 1mL/L, 2ml/L, 3mL/l etc. on the hatch rate of Artemia?

I have never written a research question or hypothesis with such specificity. Which one is better?