Which statement is true about the amount of refraction of light waves as they pass through a material, or medium?

Give more information and ill answer the question you didn't show the statements

answer; ////increased water pollution; ///////////////////////

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.