Across
- 2. A value that indicates the acidity or alkalinity of a solution on a scale of 0 to 14, based on the proportion of H+ ions present.
- 4. The accumulated biological material produced by living organisms.
- 6. Forms of a single element that differ in atomic mass due to a different number of neutrons in the nucleus.
- 8. Extracting energy for life from inorganic chemicals, such as hydrogen sulfide, rather than from sunlight.
- 9. Organism that obtains energy and nutrients by feeding on other organisms or their remains.
- 11. Systems in which there is no exchange of energy or matter with its surroundings.
- 13. Organisms that consume organic litter, debris, and dung.
- 14. Network of interdependent components and processes.
- 15. Organisms that synthesize food molecules from inorganic compounds by using an external energy source; most producers are photosynthetic.
- 18. Complex molecules organized around skeletons of carbon atoms arranged in rings or chains; includes biomolecules, molecules synthesized by living organisms.
- 20. Organisms that only eat plants.
- 21. The amount of biomass (biological material) produced in a given area during a given period of time.
- 23. a combination of two or more atoms.
- 25. A complex, interlocking series of individual food chains in an ecosystem.
- 28. Stored energy that is latent but available for use. A rock poised at the top of a hill and water stored behind a dam are examples of potential energy.
- 31. A system in stable balance.
- 32. The capacity to do work, such as moving matter over a distance.
- 33. Organisms that mainly prey upon animals.
Down
- 1. The smallest particles that exhibit the characteristics of an element.
- 2. The biochemical process by which green plants and some bacteria capture light energy and use it to produce chemical bonds. Carbon dioxide and water are consumed while oxygen and simple sugars are produced.
- 3. The flow of energy and/or matter into and out of a system.
- 5. All the organisms genetically similar enough to breed and produce live, fertile offspring in nature.
- 7. Substances composed of different kinds of atoms.
- 10. Anything that takes up space and has mass.
- 12. Fungus or bacterium that breaks complex organic material into smaller molecules.
- 16. Organisms that eat both plants and animals.
- 17. All members of a species that live in the same area at the same time.
- 19. organisms that consume carrion, or organisms not killed by the scavenger.
- 22. Potential energy stored in chemical bonds of molecules.
- 24. Minute compartments surrounded by semipermeable membranes within which the processes of life are carried out by all living organisms.
- 26. Systems that exchange energy and matter with its environment.
- 27. Energy contained in moving objects, such as a rock rolling down a hill, the wind blowing through the trees, or water flowing over a dam.
- 29. A measure of disorder and usefulness of energy in a system.
- 30. Substances that cannot be broken into simpler units by chemical means.