Name: 16. What defines a freshwater ecosystem? A. What animals live in the envir

Question

Name: 16. What defines a freshwater ecosystem? A. What animals live in the environment B. The living and non living factors C. The biotic factors only Which of the following is not a role of wetlands to nearby water sources? A. Filter nutrients and pollutants B. They increase the amount of sediments into rivers, clogging them. C. They help filter sediments before they clog up habitats in rivers and streams. 17. Which of the following is not characteristic of marine mammals? A. endothermic 18. give live birth 3 chambered heart B. C. 19. What is the benefit of countershading? A. Organisms are light on the right side of their body, and dark on the left side to protect them as they migrate northward. B. Organisms are dark on the bottom to hide them from predators below. C. organisms are dark on top to hide them from predators above D. Both a and b are correct 20. How do humans contribute to the flooding problem? A. B. C. D. They hunt migratory birds. They restore wetlands in areas that were once covered by concrete. They drain, fill, pave, and build on top of wetlands. A and B only 21. How do sponges feed? A. Flagellated colar cells grab food particles from the water as it flows through their body. They suck in water through their siphon, and crush food with powerful spicules. B. C. They are parasites that suck blood from the organisms they live on. 22. Which zone contains the phytoplankton? A sunlit zone B. dark zone C. twilight zone 23. Which of the following places would you most likely find a coral reef? A. B. C. In a tropical area next to a river delta. In tropical area with high wave energy. Along the equator in a shallow, clear water area.

Explanation / Answer

Answer:

16. option B) the living and non-living factors

17. option A) filter nutrients and pollutants

18. option c) 3 chambered heart

19. option C) organisms are dark on top to hide them from predators above.

20. option A) restore wetlands in areas that were once covered by concrete

21. option A) flagellated colar cells grab food particles from water as it flows through their body

22. option A) Sunlit zone

23. option C) along equator in a shallow, clear water area

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