Question

i need a hint
independent variable | dependent variable | controlled variable
a | b | c
| | d
choices:
molarity of nacl solution
organism
time cells are in solution
% change in mass

Explanation:

1. Independent Variable (A): This is the variable intentionally changed in an experiment. The molarity of NaCl solution is what the experimenter would adjust to test its effect.
2. Dependent Variable (B): This is the variable measured to observe the effect of the independent variable. The % change in mass of cells depends on the NaCl molarity.
3. Controlled Variables (C, D): These are kept constant to ensure valid results. The organism used and the time cells are in the solution must stay the same across all trials.

Answer:

A. Molarity of NaCl solution
B. % change in mass
C. Organism
D. Time cells are in solution