16. What can you infer about the fact that the disappearance of just one species can disrupt an entire food chain?
A. Every food chain relies entirely on a single species
C. Food chains would not exist without humans
B. Food chains can regenerate on their own
D. Food chains are extremely fragile

17. How does food web differ from food chain?
A. Food webs only contain consumers, not producers.
B. Food webs do not include decomposers.
C. Food webs contain many different interconnections, unlike food chains.
D. Food webs exist in aquatic environment while food chain only exist in terrestrial environment.

18. How do primary consumers differ from secondary consumers?
A. Primary consumers feed on plants while secondary consumers feed other consumers.
B. Primary consumers eat other consumers while secondary consumers eat plants.
C. Primary consumers eat plants and other consumers while secondary consumers eat other consumers only. D. Primary consumers decompose while secondary consumers cannot.

19. Which of the following is an example of producers?
A. Bacteria
B. Corn
C. Dog
D. Hawk

20. Where does the food chain start? A. Consumers
B. Decomposers
C. Producers
D. Sun God​