Love is like the wild rose-briar,
Friendship is like the holly-tree—
The holly is dark when the rose-briar blooms
But which will bloom most constantly?
The wild rose-briar is sweet in spring,
Its summer blossoms scent the air;
yet wait till winter comes again
And who will call the wild-briar fair?
What clues do these supporting details provide about the poem’s main idea?

i think it may mean that love is stronger than friendship

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.