A food chain shows how the organisms are related with each other by the food they eat. Each level of a food chain represents a different trophic level. Animals that come of 4^(th) level include tigers, lions etc. Explanation- A food chain refers to the sequence of events in an ecosystem, where one organism eats another and then is eaten by another organism. It's a straightforward way to understand the flow of energy and nutrients in a specific ecosystem. Here is a more detailed explanation: • Producers: These are usually plants, which sit at the base of every food chain. Plants capture solar energy from the sun through the process of photosynthesis and use it to convert water and carbon dioxide into glucose (a type of sugar). Plants then use this glucose as their food/energy source for growth and reproduction. This energy gets transferred through the food chain when plants are eaten by other organisms. • Primary Consumers: These are herbivores – animals that eat plants. Examples include rabbits, cows, and giraffes. They consume producers and get their energy from them. • Secondary Consumers: These are carnivores (meat-eaters) and omnivores (animals that eat both animals and plants). They eat primary consumers. Examples include foxes, snakes, and humans. • Tertiary Consumers: These are animals that eat secondary consumers. They are typically carnivorous predators. Lions and tigers, which can eat foxes or snakes, fit in this category. • Decomposers: Finally, decomposers, like fungi and bacteria, break down all categories of dead organisms, and in the process, they return nutrients to the soil, which can be used by producers, thus cycling the nutrients back into the ecosystem. This creates a "chain" effect – where energy moves up the levels from producer to consumer and eventually to decomposers.