Gymnosperms are characterized by the

Absence of seeds
Presence of flowers
Presence of seeds in cones
Absence of vascular tissues

The correct answer is C. Presence of seeds in cones.

Gymnosperms are a group of seed-bearing plants that do not have flowers. They reproduce by producing seeds in cones. Gymnosperms include conifers, such as pines, firs, and spruces, as well as cycads and ginkgos.

A. Absence of seeds is incorrect because gymnosperms do produce seeds.

B. Presence of flowers is incorrect because gymnosperms do not have flowers.

D. Absence of vascular tissues is incorrect because gymnosperms do have vascular tissues.