The correct answer is option 3, Forest. A forest can be considered as a dynamic living entity because it is a complex ecosystem where numerous organisms interact and depend on each other for survival. Forests are made up of various types of plants, animals, and microorganisms, all of which play crucial roles in maintaining the balance of the ecosystem. The plants in a forest provide food and shelter for animals, while the animals help in pollination and seed dispersal. The microorganisms in the soil break down organic matter and recycle nutrients. Furthermore, a forest undergoes constant changes and adaptations in response to environmental factors such as weather, seasons, and disturbances like fires or storms. Therefore, a forest can be seen as a dynamic living entity that continually evolves and sustains life within its ecosystem.