18.

What trait differentiates lilacs from pine trees?
Pine trees produce seeds.
Pine trees have leaves.
Lilacs have flowers.
Lilacs are vascular plants.

The trait that differentiates lilacs from pine trees is that lilacs have flowers, while pine trees do not.

The trait that differentiates lilacs from pine trees is that lilacs have flowers, while pine trees produce seeds. Lilacs are flowering plants and belong to the family Oleaceae, known for their beautiful and fragrant blossoms. On the other hand, pine trees are seed-producing plants and belong to the family Pinaceae.