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Biology, Ecosystems

Across
Organism that produces its own food.
All the places on Earth where things live.
The study of organisms and their interaction with each other and the environment.
Must always be recycled in the ecosystem.
A lion, because it only eats meat.
A bear, because it will eat plants or animals.
An organism that cannot make its own food.
One way nitrogen gets into the soil so plants can use it.
A place where carbon is stored and out of the atmosphere.
The amount of energy that moves from one trophic level to the next.
All the interconnected feeding relationships in an ecosystem.
Things that make food for themselves and other things that eat them.
Flows in one direction and is never recycled.
Down
The repeated movement of water from Earth's surface to the atmosphere and back.
At the beginning of many different food chains because they are producers.
Form of matter that all plants and animals need, but they cannot get it from the atmosphere.
All the different species in an area.
A cool way for nitrogen to get into water so plants can use it.
Each step in the transfer of energy and matter within a food web.
These organisms must eat something in order to get their energy.
The repeated movement of carbon into Earth's atmosphere and back to plants and animals.
All the members of a particular species in a particular area.
A cow, because they only eat plants.
The original source of almost all energy in the ecosystem.