Natural selection can cause less desirable traits to: become more common in a population form in an individual become less common in a population disappear from a population

The answer should be become less common in a population.

Natural selective means it let a specific organisms with the characteristics that are more favorable to the environment have a greater chance to survive and pass their genes to the next generation.

For example, there is black moths and white moths. Black moths can camouflage themselves into the environment, meanwhile, white moths are more likely to be seen and caught by predators. Therefore, white moths has a less desirable characteristic and eventually their number would become less because more of them are caught by predators.

But these organisms with the less diserble characteristics won't completely disappear from the population. When their number become less, they eventually know how to hide themselves or protect themselves and will do their best to increase their population.

The answer is A.  It would provide technology to improve life on earth.
The improvement doesn't necessarily for only a certain sector. Due to uncertainty that exist surrounding what might exist in space, we never knew what we might found and how those findings could contribute to the development of human life