Which organizational method is used in a speech with the following main points.
a. caused by the bite of infected mosquitoes, west nile virus has spread throughout the united states.
b. the effects of west nile virus include flu-like symptoms, convulsions, swelling of the brain, and, in some cases, death.

cause-and-effect

Explanation:

Organizing a speech in an effective way helps in providing a clear message to the audience. There are fours main parts in every speech, consisting of an introduction, a body, a transition and a conclusion.

In organizing a speech effectively, six patterns are commonly used. They are :

The cause-and-effect pattern represents how a certain action leads to a particular result or outcome.

In the context, The speech well describes the effects of mosquito bites caused by the West Nile virus.

Thus, the answer is -- cause-and-effect

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explanation: