Water levels are adjusted to meet the osmoregulatory needs of the organism in the of the nephron under the control of also called vasopressin.

economic impact of malaria is estimated to cost africa $12 billion every year. this figure factors in costs of health care, absenteeism, days lost in education, decreased productivity due to brain damage from cerebral malaria, and loss of investment and tourism.

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

here's one link: