Across
- 2. A biological community of interacting organisms and their physical environment.
- 5. An atom of an element that has a different number of neutrons.
- 6. The movement of individuals leaving a population.
- 12. Sum of protons and neutrons of an atom
- 15. The entire collection of all life on Earth.
- 16. The attraction of water molecules to molecules of a different substance.
- 17. The specific 23.5 degree angle of the Earth's axis, responsible for seasons.
- 19. Limiting factors that become more severe as population size increases.
- 21. A chemical bond where atoms transfer/steal electrons.
- 25. The movement of individuals joining a population.
- 26. A type of population growth that is rapid and unchecked.
- 27. A chemical bond where atoms share electrons.
- 28. A group of large, similar ecosystems across the Earth sharing climate and organisms.
- 29. All the water on Earth
- 31. Solutions with a pH greater than 7, often called proton acceptors.
- 32. A consumer that feeds mostly on dead animals.
- 33. Growth that is exponential at first but then stabilizes at the carrying capacity.
- 36. A consumer that feeds only on plants or fungi (primary consumer).
- 38. A negatively charged particle
- 41. An organism that creates its own food using sunlight or chemicals.
- 42. The substance that dissolves in a solution.
- 43. The attraction of molecules of the same substance, like water molecules sticking together.
- 44. The total sum of all chemical reactions needed to sustain life.
- 45. The trapping of heat in the atmosphere that warms the Earth.
Down
- 1. A consumer that feeds on both plants/fungi and animals.
- 3. The study of anything related to human populations.
- 4. All the gases surrounding the planet.
- 7. The movement of individuals leaving a population.
- 8. Any non-living part of the environment.
- 9. The maximum population size an environment can sustain indefinitely.
- 10. Areas of earth that have the hottest temperatures.
- 11. A mixture where substances remain separate and do not dissolve (heterogeneous mixture).
- 13. The number of individuals per unit area in a population.
- 14. Limiting factors that are not influenced by population size.
- 18. Ion released by bases in solution
- 20. The property of a molecule, like water, that gives it opposite charges.
- 22. A collection of food webs
- 23. The ability of an organism to maintain a stable internal environment.
- 24. An organism that consumes organic matter (usually dead) and breaks it down.
- 30. An organism that must consume other living or dead things to obtain energy.
- 34. A positively charged particle found in the nucleus of an atom.
- 35. The scale used to measure the acidity or basicity of a substance.
- 37. The dry area on the leeward side of a mountain where little rain falls.
- 39. A linear network showing how energy moves from producers to consumers.
- 40. The Earth's sphere consisting of land and rock.
- 41. Solutions with a $\text{pH}$ less than 7, often called proton donors.