1) What role do salt marshes play in an ecosystem? a) They produce low levels of biomass. b) They act as a storage tank for nutrients. c) They decrease biodiversity. 2) Interspecific competition occurs when: a) Individuals of different species share a limiting resource. b) Individuals of the same species compete for resources. c) Predators hunt their prey. d) Species form mutualistic relationships. 3) Which of the following is an example of a keystone species? a) Grasshoppers b) Beavers c) Earthworms d) Robins 4) What is the primary energy source for the water cycle? a) Wind energy b) Geothermal energy c) Solar energy d) Tidal energy 5) How does predation influence prey populations? a) It only decreases prey populations. b) It causes prey to become extinct. c) It limits growth by consumption and behavior changes. d) It has no effect on prey populations. 6) What is the significance of mutualism in ecosystems? a) It decreases biodiversity. b) It involves only plant species. c) It is crucial for pollination and reproduction. d) It leads to competition among species. 7) Which process is NOT part of the carbon cycle? a) Photosynthesis b) Respiration c) Combustion d) Evaporation 8) Which of the following best describes a biome? a) A small community of plants and animals. b) A major region with specific vegetation and wildlife. c) A single species habitat. d) An area with only aquatic life.

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