30 cases of a diarrheal disease occurred among residents of a rural midwestern community between july 1 and july 31, 2016 (usual rate: 0-1 per year). this is an example of a/an:

30 cases of a diarrheal disease occurred among residents of a rural midwestern community between july 1 and july 31, 2016 (usual rate: 0-1 per year). this is an example of a/an:

i think it's they require warm air

explanation:

tornados usually happen when it's raining right so when it's raining it cools down so if the temperature keeps changing then i think a tornado occurs sorry if it's wrong

the question isn't complete here so i can't right an answer '_'