"forest: a self sustaining, dynamic, ecosystem". explain using food chain
Forest ecosystems play a crucial role in sustainability through the capture and conversion of energy from the sun and its storage into plant material. This plant material provides food, energy and fibre for other organisms, including humans that rely on plant products directly or indirectly. Forest ecosystems change in composition over time(dynamic). This can occur naturally as forests grow, may occur due to invasion by pests and diseases that attack particular group of organisms.