Question

which of the following statements about trophic levels is accurate? a. trophic levels only include producers and primary consumers b. trophic levels are irrelevant to energy flow in ecosystems c. trophic levels represent hierarchical in an ecosystems food chain d. trophic levels only apply to terrestrial ecosystems what happens when a keystone species is removed from an ecosystem? a. no impact on the ecosystem b. decreased biodiversity c. disruption of ecosystem balance d. increased population of primary producers what role do herbivores play in an ecosystem a. they are secondary consumers b. they feed exclusively on plants c. they decompose organic matter d. they are primary producers

Explanation:

• For the first question, trophic levels represent different hierarchical positions in an ecosystem's food - chain, including producers, primary consumers, secondary consumers, etc., and are relevant to energy flow in both terrestrial and aquatic ecosystems.
• For the second question, keystone species have a disproportionately large impact on the structure and function of an ecosystem. Their removal leads to disruption of ecosystem balance and often a decrease in biodiversity.
• For the third question, herbivores are organisms that feed exclusively on plants. They are primary consumers, not secondary consumers, decomposers, or primary producers.

Answer:

1. c. Trophic levels represent hierarchical in an ecosystem's food chain
2. c. Disruption of ecosystem balance
3. b. They feed exclusively on plants