7th Grade Science Review

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Across
  1. 3. An organism that kills and eats other organisms (prey).
  2. 6. The maximum absolute variation of any periodic function (e.g., a wave).
  3. 7. An organism that cannot produce its own food.
  4. 8. An organism that is killed and/or eaten by another organism (predator).
  5. 9. A scientific principle based on many observations of naturally occurring events that demonstrate it to be without exception under certain stated conditions. See also theory.
  6. 11. rock A type of rock formed from layers of sediment.
  7. 17. variable A factor or condition in a scientific experiment that is purposefully kept the same.
  8. 19. An organism in a food chain that obtains nutrients from producers or other consumers; consumers may be herbivores or carnivores.
  9. 23. variable A factor, usually being measured or observed, that responds to, or depends on, another factor (test variable).
  10. 24. A physical property of a solid used to describe its surface.
  11. 28. The growth of new tissues or organs to replace those lost or damaged by injury.
  12. 29. A cell or organism that has two different alleles for a particular trait.
  13. 32. A term used to describe the certainty of data or results of an investigation or experiment.
  14. 33. species A species that no longer exists.
  15. 34. An animal that obtains nutrients from eating other animals.
  16. 36. rock A type of rock that is formed over time from existing rock due to extreme pressure and/or heat.
  17. 37. (scientific theory of evolution) A cumulative change in the characteristics of organisms or populations over time from generation to generation.
  18. 39. chain A diagram representing the transfer of energy from the Sun through producers and a series of consumers.
  19. 40. A statement that tells what an investigation showed, based on observations and data.
  20. 41. Multiple sets of measurements or observations in a scientific investigation.
  21. 43. An organism that obtains nutrients from both plants and animals.
  22. 44. An explanation for some naturally occurring event developed from extensive observations, experimentation, and reasoning.
  23. 45. All members of the same species living together at the same time in the same area.
  24. 46. Populations of different species of organisms living together in the same geographic area
  25. 47. The process of making more organisms of the same kind.
Down
  1. 1. A characteristic of an organism that increases its chances of survival in its environment.
  2. 2. A type of cell or organism that has identical rather than different alleles for a particular trait.
  3. 4. Making multiple sets of measurements or observations in a scientific investigation.
  4. 5. To bounce light, sound, or heat off of a surface.
  5. 8. An organism that produces its own food.
  6. 10. The process by which rocks and other surfaces are broken down.
  7. 12. Any of two or more alternate forms of a gene that an organism may have for a particular trait.
  8. 13. A feature, quality, property, or trait of an object or organism.
  9. 14. The form of a trait that is expressed or shown when the combination of alleles for this trait is heterozygous.
  10. 15. An organism that can produce food from inorganic materials (e.g., carbon dioxide, sunlight, water).
  11. 16. A living thing.
  12. 18. variable (independent variable) The variable manipulated by the experimenter in order to study changes in the outcome variable.
  13. 20. point The temperature at which a solid changes to a liquid.
  14. 21. The reproduction of a scientific investigation by another person to ensure accuracy.
  15. 22. An animal that obtains nutrients only from plants.
  16. 25. A crack in Earth's crust along which movement has occurred.
  17. 26. energy A type of energy an object has due to its motion or position.
  18. 27. trait A trait or characteristic that is passed from parent to offspring.
  19. 29. A statement that can be tested scientifically through experiments and/or other scientific investigations.
  20. 30. A term used to describe a material that cannot be clearly seen through but that allows some light to pass through it.
  21. 31. A term used to describe a material that absorbs and/or reflects light and does not allow light to pass through.
  22. 35. The loose top layer of Earth's surface made of weathered rock and organic matter.
  23. 38. A measure of how hot or cold a substance is; a measure of the average kinetic energy of the particles of a substance.
  24. 42. The form of a trait that will be masked unless the organism is homozygous for this trait.