Which of the following is an effective way to use your notes? A.
They should be used as a study guide for test review.
B.
They can be used to avoid reading the textbook.
C.
They should be used to swap notes with classmates.
D.
They should be used to answer questions on tests.

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.