Question

the passage below describes an experiment. the apple slices in josies lunch always turned brown by lunchtime. josies favorite cooking website said that pouring lemon juice on the apple slices would keep them from turning brown so quickly. josie cut an apple into eight slices. she poured two tablespoons of lemon juice over four of the slices. she did not pour lemon juice over the other four. every hour for three hours, josie counted the number of apple slices that had turned brown. in this experiment, which were part of a control group? the plain apple slices the apple slices covered with lemon juice

Explanation:

In an experiment, the control group is not exposed to the independent - variable. Here, the independent variable is lemon juice. The plain apple slices are not exposed to lemon juice, so they are the control group.

Answer:

the plain apple slices