Living beings are organisms that exhibit characteristics such as growth, reproduction, and response to stimuli. They can be classified into various categories, including animals, plants, fungi, and microorganisms. Each type of living being plays a unique role in the ecosystem, contributing to the balance of nature. All living beings are made up of cells, which are the basic units of life. These cells carry out essential functions, such as metabolism and energy production. Living beings interact with their environment and other organisms, forming complex relationships that sustain life on Earth, including processes like photosynthesis in plants and predation in animals.