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Ecology and Ecosystems 1

Across
The place in which a population lives
Nonliving things in an ecosystem
Upper layer made mostly of humus, minerals, water, and air
The role of an organism in an ecosystem
All the populations living in an area
Down
Living things in an ecosystem
Amount of base in a substance
All the organisms of one species
Naturally occurring solid materials of the earth's crust
Amount of acid in a substance
Material in soil formed by the breakdown of plants and animals
Living and non-living things living in an area
Study of organisms and how they interact in a ecosystem