Gymnosperm produce seeds using reproductive structures called

Cone.

Explanation:

· Gymnosperms are flowerless, seed-producing plants. They belong to the subkingdom Emophyte. This is because the seeds produced by gymnosperms are not encased in an ovary. Instead, gymnosperm seeds sit exposed on the surface of leaf-like structures called bracts.

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d. organisms have cells with different shapes and functions.