Which of the following statements is true? Thunderstorms usually last less than one hour.
Hurricanes rotate counter-clockwise.
Tornadoes usually happen in the late afternoon.
all of the above

All of the above

Explanation:

not sure, but my best guess is: all the above

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.

the dna molecules have a negative charge because of the phosphate groups in their sugar-phosphate backbone, so they start moving through the matrix of the gel towards the positive pole. power is turned on and dna fragments migrate through gel (towards the positive electrode).

explanation: