What is the author's purpose in this excerpt?
O to inform readers about different systems of government
to inform readers about recent governmental reforms
O to persuade readers of the need for governmental
change
to persuade readers to petition their local governments

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.