How long would it take the sound to get from the calling monkey to another monkey if the monkeys were 2 km apart? howler monkeys

✿   this landform has a high elevation and a high relief

✿   this landform is a mountain

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.