According to the text, the growing demand for african slaves during the slave trade era motivated african leader to

a. migrate large populations of people inland away from coastal threats by the shores.

b. initiate attacks of rival tribes in order to profit by selling captured africans to the europeans.

c. establish peaceful relationships wih the europeans out of fear.

d. pay the europeans lots of money to avoid becoming colonized.

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.

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