[Free Registration/Login may be required to access all resource tools.] The life cycle of a plant is very different from the life cycle of an animal. Humans are made entirely of diploid cells (cells with two sets of chromosomes). Our...

[Free Registration/Login may be required to access all resource tools.] Seedless plants can reproduce asexually or sexually. Some seedless plants, like hornworts and liverworts, can reproduce asexually through fragmentation. When a small...

A solid overview of the few plants that reproduce by spore production. Includes examples and an explanation of the early evolution of these plants.

An explanation of the plants that reproduce by the production of spores. Includes extensive graphics.

This comprehensive page discusses the Asteroid Impact vs. Volcano-Greenhouse dinosaur extinction debate. It was written by paleontologist, professor, and scientist Dr. Dewey McLean.