Biology

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Across
  1. 3. microscopic organisms that live in watery environments, both salty and fresh
  2. 5. made up of the trees, shrubs, and herbaceous plants that exist below the canopy
  3. 6. a permanently frozen layer on or under Earth's surface
  4. 8. the ability to endure unusually large doses of a drug or toxin
  5. 9. the long-term, predictable atmospheric conditions of a specific area
  6. 12. the act of leaving one's own country to settle permanently in another; moving abroad.
  7. 13. the increases in cell size and number that take place during the life history of an organism
  8. 15. an organism that can produce its own food using light, water, carbon dioxide, or other chemicals
  9. 17. the role an organism plays in a community.
  10. 19. lands where saturation with water is the dominant factor determining the nature of soil development and the types of plant and animal communities living in the soil and on its surface.
  11. 20. the process by which plants use sunlight, water, and carbon dioxide to create oxygen and energy in the form of sugar
  12. 23. a partially enclosed, coastal water body where freshwater from rivers and streams mixes with salt water from the ocean
  13. 25. the amount of living material provided by a given area or volume of the earth's surface, whether terrestrial or aquatic.
  14. 28. the study of the characteristics of populations
  15. 29. the largest unit used by scientists to describe geographic regions around the world that share similar characteristics
  16. 30. the part of the earth's atmosphere which extends from the top of the troposphere to about 30 miles (50 kilometers) above the surface and in which temperature increases gradually to about 32°F (0°C) and clouds rarely form.
  17. 31. biome (major life zone) of vegetation composed primarily of cone-bearing needle-leaved or scale-leaved evergreen trees, found in northern circumpolar forested regions characterized by long winters and moderate to high annual precipitation.
Down
  1. 1. the terrestrial biosphere in its contemporary, human-altered form using global ecosystem units defined by patterns of sustained direct human interaction.
  2. 2. matter composed of leaves and other plant parts, animal remains, waste products, and other organic debris that falls onto the soil or into bodies of water from surrounding terrestrial communities.
  3. 4. the microbial process of reducing nitrate and nitrite to gaseous forms of nitrogen, principally nitrous oxide (N2O) and nitrogen (N2)
  4. 7. the short term state of the atmosphere at a specific time and place, including the temperature, humidity, cloud cover, precipitation, wind, etc.
  5. 10. the action of coming to live permanently in a foreign country.
  6. 11. organism on the food chain that depends on autotrophs (producers) or other consumers for food, nutrition, and energy
  7. 14. the taking in and use of food and other nourishing material by the body.
  8. 16. the above-ground portion of vegetation in forests consisting of the tops of trees forming a kind of ceiling
  9. 18. the synthesis of organic compounds by bacteria or other living organisms using energy derived from reactions involving inorganic chemicals, typically in the absence of sunlight.
  10. 21. an organism that consumes other organisms in a food chain
  11. 22. made of the layers of gases surrounding a planet or other celestial body
  12. 24. an area with a particular combination of physical and biological environmental factors that affect which organisms can live within it
  13. 26. dark, organic material that forms in soil when plant and animal matter decays
  14. 27. a group of people living in the same place or having a particular characteristic in common