what name is given to factors that should not change in an experiment, science changes might affect the outcome

Variables

Explanation:

There's independent, dependent and controlled variables. Controlled variables is the one that does not change and the independent variable is the one that is changed by scientist

your answer is "the 1950's"

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.