Producers are

• A. Organisms that consume other organisms for energy.
• B. Organisms that are able to make their own food using abiotic factors.
• C. Organisms that break down dead matter.
• D. Organisms that migrate between habitats.

Answer: (B)

Producers are organisms that make their own food from inorganic material using energy from nonliving sources. In most ecosystems this means photosynthesis, where plants, algae, and some bacteria use sunlight to convert carbon dioxide and water into glucose, releasing oxygen. In environments without light, certain bacteria use chemical energy from inorganic molecules to synthesize organic compounds—this is chemosynthesis. Because they provide the initial energy source for the rest of the food web, producers form the base of ecosystems. The other options describe organisms that rely on others for energy (consumers), those that break down dead material (decomposers), or those that move between habitats (migrators), which are not producers.