What is an autotroph?

An autotroph is defined as an organism capable of producing its own food using inorganic substances, typically through processes like photosynthesis or chemosynthesis. For example, plants, algae, and some bacteria can convert sunlight or chemical energy from inorganic compounds into organic molecules, which they use for growth and energy. This ability to harness energy from non-living sources allows autotrophs to be primary producers in their ecosystems, forming the foundation of the food chain.

The other answer choices refer to different types of organisms: those that derive nutrients from dead organic matter, which are known as decomposers; those that consume other living organisms, classified as carnivores or predators; and organisms that depend on external food sources, which encompasses herbivores and omnivores. Each of these groups plays crucial roles in ecological dynamics, but only autotrophs are characterized by their ability to create food through inorganic means.