What conclusion can be drawn about a research article? research articles are always long. short research articles do not exist. research articles can be difficult to read. textbooks are harder to read than research articles.

Research articles can be difficult to read.

Explanation:

It is true that research articles can be difficult to read (although this is not always the case). The main reason for this is that research articles are usually conducted by experts in a particular field of study. And often, these researchers have their own jargon that is only known by members of the area. However, we can still read this articles if we are patient and we try to familiarize ourselves with some of the words that are commonly used in the area of study.

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mark twain, real name samuel langhorne clemens, was an american writer, humorist, entrepreneur, publisher, and lecturer. among his novels are the adventures of tom sawyer and its sequel, the adventures of huckleberry finn, the latter often called "the great american novel". wikipedia