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Across Down
5 A region of evergreen, coniferous forest below the arctic and subartic tundra regions
7 Region with little or no vegitation, long periods without rain, and extreme temperatures
9 A plain full of grasses and scattered trees and shrubs; dry climate
10 In arctic regions, the permanently frozen layer of soil or subsoil
12 A gradual process of change and replacement in a community
14 Area where fresh water from rivers mixes with salt water from the ocean
18 Process when cells produce energy from carbohydrates
20 The distance north or south from the equator
21 Cool, humid weather and abundant rainfall, where tree branches are draped with mosses, tree trunks are covered with lichens, and forest covered with ferns
22 The cyclic movement of phosphorus in different chemical forms from the environment to organisms and back
23 The mass of mostly microscopic organisms that float or drift freely in the waters of aquatic environments
24 Dominated by grasses, has few trees, and is characterized by cold winters and rainfall that is intermediate betweent that of a forest and a desert
26 The layers of treetops that shade the forest floor
28 Bacteria that convert atmospheric nitrogen into ammonia
29 A large region characterized by a specific type of climate and certain types of plant and animal communities
30 A final, stable community in equilibrium with the environment
33 Process when one community replaces another community that has been partially or totally destroyed
36 Forest or jungle near the equator; large amounts of rain; little variatioin in temperature
40 Succession that begins in an area that previously did not support life
44 Area of land that is periodically underwater or whose soil contains a great deal of moisture
45 Diagram that shows the feeding relationships
1 Process when plants use sunlight, carbon dioxide, and water to produce oxygen
2 A species that colonizes an uninhabited area and that starts an ecological cycle
3 Process in which nitrogen circulates among the air, soil, water, plants, and animals
4 One of the steps in a food chain or food pyramid
6 A long ridge of sand or narrow island that lies parallel to the shore
8 Pathway of energy transfer through various stages
11 A forest that is characterized by trees that shed their leaves in the fall
13 The basic food source in an ecosystem
14 An increase in the amount of nutrients, such as nitrates, in a marine or aquatic ecosystem
15 The region near the bottom of a pond, lake, or ocean
16 The organisms that live at the bottom of a pond, lake, or ocean
17 A foliage layer that is beneath and shaded by the main canopy of a forest
19 Organism that eats other organisms
25 The average weather conditions in an area over a long period of time
27 The height of an object above a reference point
31 Tropical or subtropical marine swamp that is characterized by the abundance of low to tall trees
32 Organism that feeds by breaking down organic matter from dead organisms
34 Limestone ridge found in tropical climates and composed of coral fragments that are depositied around organic remains
35 Type of vegetation that includes broadleafed evergreen shrubs and that is located in areas with hot, dry summers and mild, wet winters
37 The top foliage layer in a forest where the trees extend above surrouding areas
38 Treeless plain that is located in the Arctic or Antarctic
39 A shallow zone in a freshwater habitat were light reaches the bottom and nurtures plants
41 The movement of carbon from the nonliving environment into living things and back
42 Maritime habitat with grasses, sedges, and other plants that have adapted to continual, periodic flooding
43 All organisms that swim actively in open water, independent of currents
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