Find in the box above the words that mean:a small plant with yellow

The rest of this question is: a) a small plant with yellow, white or purple flowers in the springb) a tree that has long, narrow leavesc) a small bird with blue head, wings and tail and a yellow breastd) a small bird that sings especially at nighte) a large water bird with a long graceful neckf) a tree with heart-shaped and sweet-smelling flowers