Biodiversity 5.0 / 5 based on 1 ratingTeacher recommended ? GeographyEcosystems and biodiversity under threatA2/A-levelEdexcel Created by: Ellie ReidCreated on: 19-03-13 17:05 63798102145 Across 1. The total mass of living organisms per unit area. (7) 4. The entire variety of species that are found in an ecosystem. (9) 5. Affect ecosystems on a smaller scale and their relative importance varies from place to place. (5, 7) Down 2. This is the surface layer of vegetation, which over time breaks down to become humus. (6) 3. This is the safe level of harvest that can be hunted/caught/utilised without harming the ecosystem. (11, 5) 6. The variety of living organisms in an environment. (12) 7. The variety and number of different species in one area. The more species the better functioning of the ecosystem. (7, 9) 8. Have a major and widespread impact (6, 7) 9. These are non living, such as air, water, heat and rock. (7) 10. Individual members of a certain species that are found in an ecosystem. (10)
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