If you were testing how well different dish soaps cleaned grease, the independent variable would be the

dish soap because a variable (often denoted by x ) whose variation does not depend on that of another.

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.

i think the answer is composed of atoms