Question

This is written in a passive voice and needs to be be rewritten in a active voice and try to reduce the legnth. After 12 weeks had passed, each mouse was randomly placed in one of two treatment groups; in all cases, a die was

that
rolled by an experimenter for each mouse and if it landed on an even number the mouse was placed in the group
received a pill.

Answer 1

This is written in a passive voice and needs to be rewritten in an active voice and reduce length. After 12 weeks had passed, each mouse was randomly placed in one of two treatment groups; in all cases, a die was rolled (was rolled is a passive voice right now) by an experimenter for each mouse, and if it landed on an even number, the mouse was placed in the group that received a pill.