Over the past few thousand years, humans have
to bring about changes in many plant and
animal species in order to make them more
useful. examples include strong workhorses,
hunting dogs, large-eared corn, and beautiful
flower varieties. these changes were primarily
brought about by humans, using the process of
(1) mitosis (3) cloning
(2) selective breeding (4) natural selection

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.

i use alot when i f my girlfriend. i'm doing her in the bathroom at summer school. shes getting her tight jeans off and then we'll begin

explanation: