A mutation in which all or part of a chromosome
is lost is called a(an)
a. duplication
b. deletion.
c. inversion
d. point mutation.

I believe it's d... or b

Explanation:

So I'm pretty confident that it's D seeing how it substitutes or deletes but it's only ONE gene...

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.

volcanoes (an event in the geosphere) release a large amount of particulate matter into the atmosphere. these particles serve as nuclei for the formation of water droplets (hydrosphere). rainfall (hydrosphere) often increases following an eruption, stimulating plant growth (biosphere).