Biology

All organisms, regardless of their complexity, need energy to perform essential life functions like growth, reproduction, movement, and maintaining homeostasis. Energy is obtained in various forms, such as from sunlight (through photosynthesis in plants), food (through cellular respiration in animals), or chemical reactions in other organisms.

For A: While plants, algae, and some bacteria can make their own food through photosynthesis, many organisms (such as animals and fungi) are heterotrophs, meaning they obtain ...