oxygen - a gas in the air which people and animals need to survive When a tree makes its food, it gives off oxygen .
(a tree; makes; its food) (it; gives off; oxygen) (which people and animals; need; to survive When a tree makes its food) Context(which people and animals need,List([26, 55))):(which people and animals; need to survive; T:When a tree makes its food)
which people and animals need,List([26, 55))
a tree it which people and animals which people and animals
makes gives off need need to survive
its food
oxygen
to survive When a tree makes its food
T:When a tree makes its food