Is the clause in parentheses an adjective or adverb clause? groucho marx, (whose real name was julius marx), was one of four famous brothers who were all comedians.

- the heat nearly killed them that first summer.

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.