Question

When there are parts of an experiment that scientists cannot carefully control, they should A. change their hypothesis to include all the variables. B. ignore the other variables and record only the important data. C. redesign the experiment to be sure they are testing only one variable. D. try to set up a new experiment that tests a few variables at once.

Answer 1

try to set up a new experiment that tests a few variables at once.

Answer 2

A.