Common species refer to plants and animals that are frequently found in a particular area or ecosystem. These species are often well-adapted to their environment and can thrive in various conditions. Examples include the house sparrow, common dandelion, and white-tailed deer, which are prevalent in many regions around the world. The presence of common species is important for maintaining ecological balance. They often serve as key components in food webs, providing sustenance for predators and contributing to soil health. Understanding these species helps in conservation efforts and promotes biodiversity in ecosystems.