Which of the following is an example of microevolution?

a caterpillar changes form into a butterfly.
a population of birds with red feathers slowly changes to having blue feathers.
a dinosaur species evolves over time into a bird species.
a black cat has kittens with white spots.

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.

"do a testcross with a homozygous recessive plant."