The correct answer is an oligarchy
An oligarchy is a system in which a minority rules over a majority. In this case, ti would be the single political party. A historical example of this would be Sparta where a tiny minority of the population, the Spartans, ruled over the majority of the population, which was the enslaved enemies and slaves in general who weren't from wars.
Answer:
• water scarcity
Explanation:
You included no reference picture or passage for the question however the above should be the correct answer.
The question mentions characteristics that cause or lead to environmental problems.
Fertile soils and abundant rainfall are good for the environment as more crops can be planted and biodiversity will bloom.
Water scarcity however, can lead to some organisms dying, migrating and less crops being planted.
Water scarcity in general, is not a factor that is considered favorable when it comes to the characteristics of an environment.
It is now believed that the largest contributing factor to the decline of the Indus Valley civilization was an outbreak of disease--since there were no treatments and the density of the civilization led the disease to spread very quickly.