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Across 4. refers to how well we measure the object or subject 8. a set of components or parts that function together to act as a whole 10. when changes in one part of the system changes another part of the system 12. when there is a great threat of serious environmental damage we should not wait for scientific proof before taking precautionary steps 15. proof does not require that the premises be true, only that the reasoning is fool proof, conclusion is from general to specific 17. deliberately simplified construct of nature 21. generalizations are based on a number of observations, conclusion is from specific to general 22. data that have numerical values 23. a way of expressing our certainty, refers to chance of an event occurring 24. the statistical study of human populations 25. models that offer broad, fundamental explanations of observations 26. an observation about a particular thing agreed by all 27. a condition that the system returns to if disturbed and the cause of the disturbance stops

Down 1. an ecosystem from which we are harvesting a resource that is still able to maintain its essential functions/properties 2. same quantity of that resource can be harvested each year for an unlimited amount of time 3. a generalization that arises from a set of observations 4. an increase in input leads to a further increase in output 5. life affects the environment at a global level because earth acts like a living planet 6. widespread hunger occurring when population exceeds food supply 7. growth occurring at a constant rate rather than a constant amount 9. general study of population changes 11. an increase in input leads to a later decrease in output 13. maximum number of individuals of a species that can be sustained by the environment for a long time 14. the application of scientific knowledge that benefits human society 15. a statement can be said to be scientific if someone can state a method by which it could be disproved 16. all individual organisms that are capable of interbreeding 18. refers to what we know about the object or subject 19. the environment has value because it benefits individuals economically or is necessary for human survival 20. a group of individuals of the same species living in the same area