Select the two adjectives . Don't select any articles (a, an, or the). Dolphins use echolocation type of natural sonar-to detect the size, shape, and speed of an object. To do so, they emit rapid clicks and then interpret the echoes.

During the revising stage in the writing process, the author freely explores topics for further inclusion in the work polishes the writing, fixing minor grammatical errors gets his or her ideas down in roughly the form he or she intends corrects major errors and improves the work's content