Which kind of research is most likely to improve the health of the
environment?

The environment   play a role in people mental and physical being.

Explanation:

Environment  quality and human health  remain factors and taking into multiple interactions economic and cultural context.

Environment through air pollution, chemicals, poor quality water and natural area loss, increase in rates obesity, diabetes, and diseases.

Environment factors are particular matter, environmental tobacco smoke leading,and indicative ranking of environmental impacts of health.

Environment across depend on the pressures relate to pollution and natural resources,pollution reduction and the natural environment distribute populations.

Environmental quality can be policy and population group, incomes, elderly and the educational status, environment burden they focus on health and complex causal path.

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link:

c: warm water flows from the western tropical pacific toward south america. that should be the right answer! hope it .