What percentage of the land on earth is usable, for living on, but not for agriculture/farming?
b. what percentage of the land on earth can be used for agriculture/farming?
c. what percentage of the earth's surface is covered by land?
d. what percentage of the earth's surface is covered by water? (from data table on work file)
e. what percentage of land on the earth's surface is inhospitable lands.

answer; ///i do believe that the correct answer is (c) hold atoms together to form compound;

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.