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Save the Planet

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Across
2
Prevention of wasteful use
7
Coniferous trees
10
Smallest structural and functional unit of an organism
11
Earth and Mars, e.g.
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4840 square yards
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Limbless cold-blooded vertebrate animal with gills and fins
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Biological community of interacting organisms and their physical environment
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Branch of biology that studies the interactions among organisms and their biophysical environment
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Development that meets the needs of the present without compromising the ability of future generations to meet their own needs
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Use more than once
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Chemical element with atomic number 8
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Organic waste as a soil conditioner
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Chinook, Coho, Sockeye, Chum, and Pink, e.g.
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Natural occurrence of rock or sediment that contains minerals like iron or gold
Down
1
A marked effect, impression, or impact
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Great in size
4
Feeling or showing gratitude
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Convert to another purpose
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Greenhouse for 13-Across
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Fourth note of the major scale
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Not out
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Lessen
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A male person previously identified
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Satisfy
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Atlantic, Pacific, Arctic, Indian, and Southern
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Avocado dip
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Shore
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Harmful
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Larger
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Alike