Control group definition

the standard to which comparisons are made in an experiment. a typical use of control group is an experiment in which the affect of a treatment is unknown and comparisons between the control group and the experimental group are used to measure the effect of the treatment.

Explanation:

(Hope this helps a bit)

advantage of using stem cells in medical research:

1.       it provides medical benefits in the fields of therapeutic cloning and regenerative medicine.

2. it provides great potential for discovering treatments and cures to a variety of diseases including parkinson disease, spinal cord injuries, diabetes, alzheimer’s disease and many more.

3. limbs and organ could be grown in lab from stem cells and then used in transplant or treat illness.

d.

hope to be marked brainliest