How to tell if a german noun is masculine or feminine?

Which of the following is an essential element of a strong informative/explanatory text? a. it expresses an opinion on a topic. b. it has a clear organizational structure. c. it uses text features, such as headings. d. it includes graphic elements, such as images.

Which item is an example of a primary source

“most”, “usually”, and “in general” are examples of: rebuttals tentative language qualifiers grounds