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Will Durkee's science crossword

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Across
4
non-living chemical and physical parts of the environment that affect living organisms and the functioning of ecosystems
6
group living in the same place and sharing characteristics
8
number of people per unit of area
11
a system of interlocking and interdependent food
12
one of the four layers that surround the Earth
13
a linear network of links in a food is starting from producer organisms
15
Place where an organism or a biological population normally lives or occurs.
Down
1
organisms of the same group or species, which live in a particular geographical area
2
an input or variable such that a small change in it from the present value would cause a non-negligible change in an output or other measure of the system.
3
the journey water takes as it circulates from the land to the sky and back again.
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affect the organisms in an ecosystem
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a biological community of interacting organisms and their physical environment
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biology that deals with the relations of organisms to one another and to their physical surroundings.
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a relationship between two or more organisms that live closely together.
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the way in which an organism fits into an ecological community or ecosystem.