What is the purpose of the lines that are underlined? O These are answers to topic questions, and the paragraphs after them explain the answers. O These are summary points so that the reader could just read these lines and understand the passage. O These are conclusions that summarize all of the information in the paragraphs before them. O These are headings that give titles to the topics being discussed in the paragraphs after them.

hm, switch the relative; nominative and indefinite; objective ? not too bright in the knowledge of the english.

comfortable

explanation:

one type of the adjectives is predicate adjective. a predicate adjective is an adjective which follows a linking verb and modifies or refers back to the main subject of that linking verb.

it usually is used just before the noun it modies.

here in this example:

'penguins seem comfortable in the coolest habitats', comfortable is the predicate adjective which follows the linking verb 'seem' and modifies the noun.

a simple sentence must have at least one dependent clause.