It's all the above. The scientific method is important to make these kind of finds.
Answer:
The interjection is a part of speech which is more commonly used in informal language than in formal writing or speech. Basically, the function of interjections is to express emotions or sudden bursts of feelings. They can express a wide variety of emotions such as: excitement, joy, surprise, or disgust.
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An effect generated by a cause can itself become the cause of the next effect
