How old do paleontologist believe the earth is?

Scientists now know the Earth is actually 4.54 billion years old, an age built on many lines of evidence from the geologic record.

Explanation:

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.

gold i'm pretty sure i might be wrong