Question

what can help show how energy and matter flow together in an ecosystem? a plant a food web a mammal

Explanation:

A plant or mammal is just a single organism in an ecosystem and cannot illustrate the overall flow of energy and matter between different organisms and the environment. A food web, however, maps the feeding relationships across multiple species, showing how energy and nutrients transfer from producers to various levels of consumers, and how matter cycles through these interactions.

Answer:

A food web