Which of the following is an advantage of biomass as an energy source?
A. It produces a great deal of energy from very little material
B. It produces no greenhouse gases.
C. It is a renewable resource.
D. It is more efficient than the use of fossil fuels.

a

Explanation:

thymine. in rna, thymine is replace by uracil

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.