Which organisms fix the Sun's radiant energy to make food from simple inorganic materials?

Producers

The correct answer is a) Producers.

Producers are the organisms that fix the Sun's radiant energy to make food from simple inorganic materials. These organisms, including plants, algae, and certain bacteria, are also referred to as autotrophs. They have the unique ability to utilize sunlight, carbon dioxide, and water to carry out photosynthesis, converting these raw materials into organic compounds such as glucose.

Through photosynthesis, producers capture solar energy and convert it into chemical energy stored in the form of carbohydrates, lipids, and other organic molecules. This process is fundamental in the production of food and energy for the entire ecosystem.

Consumers (option b) obtain their energy by consuming other organisms, including producers. Decomposers (option c) break down organic matter into simpler substances and play a crucial role in nutrient recycling. (option d) The term "primary carnivore" refers to an organism that directly consumes herbivores or primary consumers as a source of food. In a food chain or food web, primary carnivores occupy a trophic level higher than herbivores but lower than secondary carnivores.