What types of organisms need energy to live?

All living organisms need energy to sustain their biological processes. This includes plants, which harness energy through photosynthesis, and animals, which obtain energy by consuming food. Microorganisms, such as bacteria and fungi, also require energy for growth and reproduction, often deriving it from organic or inorganic substances. In essence, energy is essential for all life forms to carry out metabolic activities and maintain homeostasis.