How can we make the world a better and healthier place?

People need to have access to clean water
People need to have be able to live in an environment that is not toxic
People need to have access to vaccines.
People need to understand the negative regarding the use of tobacco
People need to have a good education.
People need to be peaceful toward each other.
People need to not take advantage of their fellow human
Admittedly, some of this is subjective and is my opinion.

Your answer is  d.)relationship between pressure and air volume and led to the understanding of how respiration works