When a river flows over time, it may leave a deep groove with tall sides called a(n)? Possible answers in photo.

Canyon.

Explanation:

Weathering, volcano, mountain, and erosion are not good answers.

Hope this helped :)

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.