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Across 4. is the increasing concentration of toxic substances in organisms as trophic levels increase in a food chain or web (2 Words) 6. Variety of ecosystems that are present in the biosphere is called... (2 Words) 7. Separation of an ecosystem into small pieces of land (2 Words) 10. Defined as a loss of about three quarters of all species in existence across entire Earth over a short period of time (2 Words) 19. Change in population from high birth and death rates to low death and birth rates (2 Words) 22. The average annual rate of change of population size during a specific period (3 Words) 23. Action of distributing something is called... 24. Excessive use of species 25. Once theses are used up, there are no more (2 Words)

Down 1. Any influences on a population's birth or death rates, regardless of the population density. (3 Words) 2. The variety of life in an ecosystem 3. Action of coming to live permanently in a foreign place 5. A long constant use of a resource that does not deplete it (2 Words) 8. Substances that comes from the earth that can be reproduced over time (2 Words) 9. occurs when birth plus immigration equals death plus emigration (3 Words) 11. Substance that can be replaced over time (2 Words) 12. The study of statistics such as births, deaths, income, 13. Maximum number of individuals in a species that an environment can support for a long term (2 Words) 14. Variety of genes or inheritable characteristics that are present in populations (2 Words) 15. Ongoing extinction of individual species due to environmental factors such as climate change (2 Words) 16. number of different species and the relative abundance of each species in a biological community (2 Words) 17. occurs when fertilizers, animal waste,or other substances rich in nitrogen and phosphorus flow into waterways causing increased algae growth 18. Measurement of population per unit of area, (2 Words) 20. A plant or animals goes away permanently is called... 21. The composition of a population in terms of the proportions of individuals of different ages (2 Words)