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Ch 18 iWork

Ethan Sheumaker

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Across
2.converts atmospheric nitrogen and converts int into ammonia
6.1. any process of combining atmospheric nitrogen with other elements, either by chemical means or by bacterial action: used chiefly in the preparation of fertilizers, industrial products, etc.
8.an organism that eats other organisms
15.a nonliving condition or thing, as climate or habitat, that influences or affects an ecosystem and the organisms in it
16.an organism that feeds by breaking down dead organism
18.the rate in which the biomass accumulates in an ecosystem
21.the move of phosphorus to different chemical forms
23.a place where an organism lives
25.a model that represents or describes the relationships between the components of an ecological system
29.an organisms response to change in the environment
30.process by which nitrates are produced in the soil
31.an organism that can make organic molecules from nonorganic molecules
32.the circulation of carbon atoms in the biosphere as a result of photosynthetic conversion of carbon dioxide into complex organic compounds by plants, which are consumed by other organisms: the carbon returns to the atmosphere in the form of carbon dioxide as a result of respiration, decay by fungi, bacteria, etc., and combustion of fossil fuels.
34.an organism that just eats plants
36.the state of being inactive
38.an organism that just eats meat
39.the branch of biology dealing with the relations and interactions between organisms and their environment, including other organisms.
40.a series of organisms interrelated in their feeding habits, the smallest being fed upon by a larger one, which in turn feeds a still larger one, etc.
Down
1.an organism position in the food chain
3.the rate at which organic matter is assimilated by plants and other produceres
4.the ecosystem comprising the entire earth and the living organisms that inhabit it.
5.formed by the interaction of a community of organisms with their environment.
7.a series of organisms related by predator-prey and consumer-resource interactions; the entirety of interrelated food chains in an ecological community.
9.a grop of various species that live and interact with each other
10.the continuous sequence of events by which atmospheric nitrogen and nitrogenous compounds in the soil are converted, as by nitrification and nitrogen fixation, into substances that can be utilized by green plants, the substances returning to the air and soil as a result of the decay of the plants and denitrification.
11.the passage of water through a plant from the roots through the vascular system to the atmosphere.
12.the quality or condition of being interdependent, or mutually reliant on each other
13.a living thing, as an animal or plant, that influences or affects an ecosystem
14.formation of ammonia
17.The flow of chemical elements and compounds between living organisms and the physical environment. Chemicals absorbed or ingested by organisms are passed through the food chain and returned to the soil, air, and water by such mechanisms as respiration, excretion, and decomposition. As an element moves through this cycle, it often forms compounds with other elements as a result of metabolic processes in living tissues and of natural reactions in the atmosphere, hydrosphere, or lithosphere
19.a consumer that feeds on dead organisms
20.production of carbohydrates through the use of enegry
21.a group of organisms of the same species that live in a specific geographical area and interbreed
22.Also called: hydrologic cycle the circulation of the earth's water, in which water evaporates from the sea into the atmosphere, where it condenses and falls as rain or snow, returning to the sea by rivers or returning to the atmosphere by evapotranspiration
24.a graph of performance of an organism versus the value of an environmental varible
26.the liberation of nitrogen from compounds containing nitrogen
27.water that is naturally in the ground
28.a large number of animals
33.an organism that eats both plants and meat
35.the amount of living matter in a given habitat, expressed either as the weight of organisms per unit area or as the volume of organisms per unit volume of habitat
37.the position or function of an organism in a community of plants and animals

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