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flat grassland regions
a major mountain system of the United states and Canada, extending 3,000 miles from Alaska south to New Mexico
the mathematics of generalized arithmetical operations
a torpid state resembling sleep
the act of participating in an athletic competition involving running on a track
a system formed by the interaction of a community of organisms with their physical environment
organism's role, or job, in its habitat
Place where an Organism lives
scientific study of interactions among organisms and between organisms and their environment