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week 4

Across
The sum of conditions affecting an organism, including all living and nonliving thinks in an area such as plants, animals, water, soil, weather, landforms, and air.
A change of energy from one form to another.
An imaginary circle around the Earth's surface located between the poles and a plane perpendicular to its axis of rotation that divides it into the Northern and Southern Hemispheres.
Down
A pyramid diagram that compare the amount of energy available at each position, or level, in the feeding order.
A substance that cannot be reduced to a simpler substance by chemical means.
A quantity that describes the capacity to do work; a source of usable power.