Living organisms are entities that exhibit characteristics of life, such as growth, reproduction, and response to stimuli. They can be classified into various categories, including plants, animals, fungi, and microorganisms. Each type plays a unique role in ecosystems and contributes to the balance of nature. These organisms are made up of cells, which are the basic units of life. Cells carry out essential functions, such as metabolism and energy production. Living organisms interact with their environment, adapting to changes and evolving over time, which is crucial for their survival and the health of the planet.