Across
- 3. a relationship in which both species benefit
- 4. is the practice of clearing large areas of land to plant a single highly productive crop year after year
- 5. pathways of cellular respiration that require oxygen
- 6. is any nonliving part of the environment, such as sunlight, heat, precipitation, humidity, and so on
- 8. "feed" by chemically breaking down organic matter
- 11. describes not only what an organism does but also how it interacts with its biotic and abiotic factors
- 12. is a harmful material that can enter the biosphere
- 14. a fundamental concept of biology
- 16. a portion of the cell outside the nucleus
- 20. energy to start reaction
- 22. captures light energy and uses it to power chemical reactions that convert carbon dioxide and water into oxygen and energy rich carbohydrates
- 23. species the first species to colonize barren areas
- 24. Factor is a factor that controls the growth of a population
- 25. is the maximum number of individuals of a particular species that a particular environment can support
- 26. are located near the nucleus and help organize cell division
- 28. the number of males and females of each age a population contains
- 29. stimulate the growth and division of cells
- 33. resources that cannot be replenished in a reasonable amount of time
- 34. are made mostly from carbon and hydrogen atoms
- 35. is a large membrane enclosed structure that contains genetic material in the form of DNA
- 36. the fluid portion of the chloroplasts, outside the thylakoids
- 37. airborne acids that can drift for many kilometers
- 38. experiment: when one variable I changed when the others do not change
- 39. the general place of where an organism lives
- 41. variable: a variable that is deliberately changed
- 43. the basic units of life
- 44. can be produced or replaced by a healthy ecosystem
- 46. the reactants of enzyme-catalyzed reaction
- 49. is attraction of the molecule of the same substance
- 50. chain is a series of steps in which an organism transfers energy by eating and being eaten
- 51. Each step in a food chain or food web
- 53. the center of the atom
- 54. is a special kind of wetland, formed when a river meets a sea
Down
- 1. the zone where photosynthesis cannot occur
- 2. the nutrient whose supply limits productivity
- 7. is a process of programed cell death
- 8. loss of forests
- 9. is a particular point of view viewed in a personal way
- 10. the first set of reactions in cellular respiration
- 13. are small organelles filled with enzymes
- 15. "without air"
- 17. is the amount of energy needed to raise the temperature of 1 gram of water 1 degree Celsius
- 18. cancer cells form a mass of cells
- 19. when ecosystems spilt
- 21. is any living part of the environment with which an organism might interact, including animals, plants, mushrooms, and bacteria
- 27. are the first producers of energy-rich compounds that are later used by other organisms
- 30. living together
- 31. is the process that releases energy from food in the presence of oxygen
- 32. which means "living planet"
- 40. is the diffusion of water through selectively permeable membrane
- 42. is the day to day conditions of Earth's atmosphere
- 45. is the total number of all the genetically based variation in all the organisms in the biosphere
- 47. consists of all life on Earth and all the atmosphere
- 48. is an organized way of gathering and analyzing evidence about the natural world
- 52. light absorbing molecules