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Across 2. The biomass gained by hetrotrophs through feeding and absorption measured in units of mass or energy per unit area per unit time. 3. The quantity of organic matter produced, or solar energy fixed, by green plants per unit area per unit time. 4. The extent to which a given interaction with the environment exploits and utilises the natural income without causing long-term deterioration to the natural capital. 5. A measure of chaos, disorder, randomness. 7. Spread their reproductive investment among a large number of offspring so they are well-adapted to colonise new habitats rapidly. Lower chance of survival long-term. 8. The arrangement or patterning of plant communities or ecosystems into parallel or sub-parallel bands in response to change, over a distance, in some environmental factor. 9. The entropy of an isolated system not in equilibrium will tend to increase over time, approaching a maximum value at equilibrium. 10. A measure of the dissolved oxygen required to break down the organic material in a given volume of water through aerobic biological activity. 12. A community of interdependent organisms and the physical environment they inhabit. 13. Energy can neither be created nor destroyed. It can only change forms. In any process, the total energy of the universe remains the same. 14. The quantity of biomass potentially availiable to consumers in an ecosystem. It is measured in units of mass or energy per unit area per unit time. 15. Something non-living and physical that may influence an organism or ecosystem 16. A system that exchanges neither matter nor energy with its environment. 17. The orderly process of change over time in a community. Changes in the community of organisms can frequently cause changes in the physical environment which allows another community to establish itself and replace the former through competition. 18. As temperature approaches absolute zero, the entropy of a system approaches a constant minimum.

Down 1. A detailed survey required in many countries to measure environmental conditions before beginning development to identify areas and species of conservation importance. 6. Produced through the effect of ultraviolet light on the products of internal combustion engines. It may contain ozone. 11. The amount of living diversity per unit area.