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Across 4. total number of characteristics of a specific species, subspecies or group of species 6. suggested that the world could be divided into six biogeographic regions 7. the total amount of organic matter on Earth or in any ecosystem or area 9. comparatively small habitat separated from a major habitat of some kind 11. Those better able to survive and reproduce leave more offsprings 14. the use of biomass to release energy that can be used to do work 15. biogeographic region comprising of Central and South America 16. refers to the variety of life forms in an area 17. the capture of usable energy from the environment to produce organic compounds in which that energy is stored 19. a major zone of treeless level or rolling ground found in cold regions, mostly north of the Arctic Circle (Arctic tundra) 20. the ratio of energy output to input

Down 1. biogeographic region comprising of North America and Greenland 2. refers to the change in inherited characteristics of a population from generation to generation 3. the ratio of production of one trophic level to the production of the next trophic level 5. open grasslands, usually with scattered bushes or trees, characteristic of much of tropical Africa 8. explained diversity of life forms thru biological evolution 10. species that produce their own organic matter from energy source and inorganic compounds 12. change in biomass over a given time 13. community of plants and animals that have common characteristics for the environment they exist in 18. living organisms classified into groups based on evolutionary similarities