Ecology test - mark scheme
1. If two populations separated by a physical barrier could potentially and successfully interbreed then they are classified as 2. Which of the following are maintained in an ecosystem by nutrient cycling? I Nitrates II Carbon III Energy A I only B 1 and II only C I and III only D I, II and III 3. Which statement best describes the role of plants and algae in an ecosystem? 4. In what form is energy lost from the...