The correct answer is diseases.
Diseases are caused by many agents or factors found in the environment. Yet, some of these diseases are curable, while some are not. These diseases are curable, but sometimes they take a huge toll on an individual's life that may change that person for his or her whole life, which is why prevention is always better than cure.
Birth control a.k.a. "the pill"
I hope this answer was helpful!! :)
Expert power results from one's specialized knowledge.
There must be an earthquake detector in place to detect any earthquakes off the shores in the oceans. This system can be a regional or local system, and although the system is fallible the margin of error is very small.
Sometimes though the earth quake/movement is too close to shore to detect it in time, and people get caught in it as a result.
There also needs to be a universal warning signal that actually tells people that the tsunami is coming.
I hope this helped.