Dna extraction is a useful technique for scientists because it can be used a. to see the nuclei of cells b. to absorb viruses c. to verify a person’s personality d. to determine if people are related

DNA comprises the genetic makeup of every organism. It carries genetic information that is used by the organs in the body to determine what functions to carry out.

DNA cannot be used to see the nuclei of cells or absorb viruses. A person's personality cannot be determined from DNA.

The answer is D. to determine if people are related, as DNA between two people can be compared for similarities of code between the two.

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.