Question

unlike other conifers, pine trees produce ________. leaves in clusters seeds within fruits secondary vascular tissue multicellular pollen grains

Explanation:

Pine trees are conifers. They are unique in that they produce leaves in clusters called fascicles. Conifers do not produce seeds within fruits (they are gymnosperms). Most conifers have secondary vascular tissue and multicellular pollen grains are common among seed - plants including conifers.

Answer:

leaves in clusters