1. D. Argumentation
Argumentative essays is a genre of writing where a certain topic is discussed, explored and inspected. It often makes use of empirical research. The writer then chooses a side on the topic, explaining his opinion on the matter in a compelling, evidence-based essay. It usually uses first person to make the writer's ideas and stand on the issue clear and concise.
2. B. Credible
Sources are the basis for informed opinion. Thus, it must be credible.
Answer;
A search engine uses machines to index webpages; a gateway is compiled by experts or librarians.
Explanation;
Gateway pages are pages specially optimized for one search engine and 1-3 keywords. Gateway pages or doorways stand on their own, separate from the rest of a site.
A search engine is a software designed to search for information on the internet.
