[Solved] What characteristic of a star cluster is used to determine its age? A)the ratio of main sequence to white dwarfs stars B)the number of red giants C)the faintest stars seen in the cluster D)the main sequence turnoff E)the total number of stars in the cluster Horsetails: A group of vascular plants in the genus Equisetum, known for their jointed, hollow stems and reproduction through spores, not seeds. Terrestrial Life: Organisms that live and thrive on land, as opposed to in water or air. Land Plants: A large group of terrestrial plants, including bryophytes, ferns, and seed plants, that are key contributors to terrestrial ecosystems and the global oxygen cycle. Megafossils: Large fossilized remains or impressions of plants or animals visible to the naked eye, used in the study of paleontology.