Which is an example of matter cycling through the bodies of living things?
O
A. Whales swimming in the ocean
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B. Plankton moving with the tide
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C. People visiting the aquarium
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D. Whales eating plankton

Please help!

I think D. This is a hard one.

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.