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Will Durkee's science crossword

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