Spores are tiny, reproductive units produced by certain plants, fungi, and bacteria. They are often single-celled and can develop into a new organism under the right conditions. Spores are designed to survive harsh environments, allowing them to remain dormant until conditions are favorable for growth. In the plant kingdom, spores are commonly associated with ferns and mosses, which reproduce without seeds. In fungi, spores are released into the air and can spread over large distances, helping to colonize new areas. This reproductive strategy is essential for the survival and propagation of these organisms.