The Arctic is the smallest of the world's four oceans, but it may play a large role in helping scientists monitor Earth's climate shifts.
(The Arctic; is; the smallest of the world's four oceans) (it; may play; a large role; L:in helping scientists monitor Earth's climate shifts)
The Arctic it
is may play
the smallest of the world's four oceans
a large role L:in helping scientists monitor Earth's climate shifts