A. Read the article below. Observe the grammatical errors in the article. Why do viruses mutate? by Maria Cohut, Ph.D. and Yella Hewings-Martin, Ph.D. Viruses are prone to mutations. Indeed, all genetic material, including that of humans, can mutate when mistakes occur during replication. A mutation of a virus occurs when there is a change in its genetic sequence. This creates variation and drives virus evolution. Mutations will be lead to changes in the proteins that are encoded in the viral genetic code. These changes can either be advantageous, harmful, or neutral. How many mutations does it take to produce a new strain of the virus? This is not easy to answer, in part because scientists disagree about the definition of the word "strain." In general, if a virus has enough mutations to make its biology significantly different, it may be a considered new strain. This means that it may respond differently to vaccines or treatments, or it may infect a different species or transmit in a different way. But if the biology of the virus broadly remains the same, despite the mutations, the term "variant" may be more scientifically accurate. Since the starting of the pandemic, there has been much discussion about SARS-CoV-2 mutations and what implications they may have. SARS- CoV-2, like many other coronaviruses, has an enzyme that proofreads its genetic code during replication, reducing the rate of mutations. While the novel coronavirus has a relatively stable genome, in being compared with other types of virus, it does mutate sometimes, and scientists have closely monitored these changes. One of the most widely talked about mutations has resulted in the D614G variant. This will causes a change in the spike protein, which interacts with the ACE2 receptor on human cells to facilitate viral entry. Specifically, an amino acid in the spike protein at position 614 is changed from aspartic acid to glycine. Research by Dr. Bette Korber, from the Los Alamos National Laboratory, in New Mexico, and colleagues suggests that this change allows the variant to infect people more easily. The D614G variant has become the predominant variant of SARS-CoV-2 worldwide, the research shows. The team's data is an indicating that people with the D614G variant of the virus may have higher levels of viral RNA than people with the original variant. But no evidence indicates that this causes more severe COVID-19. Still, not all scientists agree with this group's interpretation. Referring to the paper, Dr. Nathan Grubaugh, from the Yale School of Public Health, in New Haven, CT, and colleagues commented that more research is needed. to support the idea that this variant is indeed more transmissible. While researchers continue to study the differences between the D and G variants, the world has turned its focus toward B.1.1.7 and how it may shape the course of the pandemic.


B. Write down the grammatical errors found in the selection and revise these sentences considering some of the basic grammar rules. Follow the format below. Write your answer in a 1 whole sheet of paper. Sentences with Grammatical Error Revised Sentences​