Levels of Biological Organization: * Organism: * The fundamental unit of life. * In a marsh, examples of organisms include: * Plants: Cattails, reeds, grasses * Animals: Frogs, turtles, fish, insects * Microorganisms: Bacteria, fungi, algae * Population: * A group of organisms of the same species living in the same area at the same time. * Examples in a marsh: * A population of cattails * A population of frogs * A population of bacteria * Community: * All the populations of different species interacting with each other in a particular area. * A marsh community would include: * Plants, animals, and microorganisms * Interactions such as predation (e.g., frogs eating insects), competition (e.g., plants competing for sunlight), and symbiosis (e.g., bacteria living in the roots of plants) * Ecosystem: * A community of organisms and their physical environment interacting as a unit. * A marsh ecosystem includes: * The marsh community (plants, animals, microorganisms) * The physical environment (water, soil, air, climate) * Interactions between the community and the environment (e.g., nutrient cycling, energy flow) * Biosphere: * The part of Earth that supports life, including all ecosystems. * A marsh wetland is a small part of the global biosphere.Remember: This is a general outline. The specific organisms and interactions in a particular marsh wetland may vary.