Final answer:
In biology, a complete food chain includes a producer, consumer, and decomposer. The examples provided are instances of the flow of energy and nutrients from producer (grass or tree), to primary consumer (rabbit or bird), secondary consumer (owl or fox), and finally to the decomposer (mushroom). These are examples of grazing food webs.
Step-by-step explanation:
The student has asked for two complete food chains that include a producer, consumer, and decomposer. A food chain represents the linear flow of energy and nutrients in an ecosystem, starting from producers, going through consumers, and ending with decomposers. The first food chain is: Grass (Producer) -> Rabbit (Primary Consumer) -> Owl (Secondary Consumer) -> Mushroom (Decomposer). This is an example of a grazing food web, in which energy and nutrients move from plants (producers) to herbivores (primary consumers) and then to carnivores (secondary consumers). The second food chain is: Tree (Producer) -> Bird (Primary Consumer) -> Fox (Secondary Consumer) -> Mushroom (Decomposer). This represents a different grazing food web, but the flow of energy and nutrients is the same – from producer to consumer to decomposer.
Learn more about Food Chain