Many farmers use pesticides, which are chemicals that kill insects and increase the productivity of crops. one such pesticide, ddt is now illegal because it was too effective. it not only killed insects, but also killed predatory animals of insects, like birds, and entered the food chain and affected humans. why do you think that the fda banned the use of ddt?

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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.