Question

think about the lab procedure you just read. label each factor below v if it was variable during the procedure or c if it was constant. molecule size (large starch molecules vs. small glucose molecules) material used as the membrane amount of substances used number of trials whether the molecules diffused through the membrane (tubing)

Explanation:

In a lab - procedure, variable factors change during the experiment and constant factors remain the same. Molecule size can vary depending on the substances used, so it's a variable. The material of the membrane is usually set for the experiment and is a constant. The amount of substances used can be adjusted and is a variable. The number of trials can be decided differently and is a variable. Whether molecules diffuse is an outcome and not something controlled as a constant or variable during the setup of the experiment, but considering the nature of the experiment, it can vary based on the substances and conditions, so it's a variable.

Answer:

1. V
2. C
3. V
4. V
5. V