About how many times each day does your circulatory system transport blood between the heart, lungs, and other organs? A. 100 B. 500 C. 1,000 D. 1,500

a. 100 or b.500 I think it's b. but I don't know for sure

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.

rising temperatures because when water vapor in the air is cooled, it condenses. it turns back into a liquid and attaches to dust particles in the air. these very small water droplets group together to form clouds