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Review papers summarize the research done in a particular field over a period of time . Biology is the science that studies life , but what exactly is life ? This may sound like a silly question with an obvious response , but it is not always easy to define life . For example , a branch of biology called virology studies viruses , which exhibit some of the characteristics of living entities but lack others . It turns out that although viruses can attack living organisms , cause diseases , and even reproduce , they do not meet the criteria that biologists use to define life .
Please check all the words that can be used instead of the target word in the same context. Note that the morphology of the target (third person singular, past tense etc.) is considered to be applied to the candidate automatically in the process of paraphrasing.