Question

1. ccc system models which model best illustrates the flow of energy and matter in an ecosystem—a food chain or a food web? explain.
2. sep evaluate information a student says an organism that is both a first-level and second-level consumer is an omnivore. is that student correct? explain.

Explanation:

1.

A food web better illustrates the flow of energy and matter in an ecosystem. A food chain shows a linear sequence of who eats whom. But in reality, ecosystems are complex. Organisms have multiple food sources and are preyed upon by multiple organisms. A food web, which is a network of interconnected food chains, can represent these multiple feeding relationships. It shows how energy and matter can move through different paths in the ecosystem, accounting for the complexity of real - world ecological interactions.

A first - level consumer (primary consumer) eats producers (usually plants). A second - level consumer (secondary consumer) eats first - level consumers. An omnivore is an organism that eats both plants (producers) and animals (consumers). So, if an organism is both a first - level and second - level consumer, it must eat both producers (to be a first - level consumer) and first - level consumers (to be a second - level consumer), which is the definition of an omnivore.

Answer:

A food web. Because it shows the complex, interconnected feeding relationships (multiple food sources and multiple predators for organisms) which better represent the real - world flow of energy and matter in an ecosystem compared to the simple linear nature of a food chain.

2.