Ecology test - mark scheme

1. If two populations separated by a physical barrier could potentially and successfully interbreed then they are classified as2. Which of the following are maintained in an ecosystem by nutrient cycling?I NitratesII CarbonIII EnergyA I onlyB 1 and II onlyC I and III onlyD I, II and III3. Which statement best describes the role of plants and algae in an ecosystem?

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