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Which process helps keep temperatures on Earth from becoming too hot or too cold?
photosynthesis
It flows in one direction
grass
They return nutrients to soil.
greenhouse effect
fixation
Sun -- grass -- rabbit --fox
a deer drinking from a stream
Which is true of energy in ecosystems?
photosynthesis
It flows in one direction
grass
They return nutrients to soil.
greenhouse effect
fixation
Sun -- grass -- rabbit --fox
a deer drinking from a stream
Which best represents a food chain?
photosynthesis
It flows in one direction
grass
They return nutrients to soil.
greenhouse effect
fixation
Sun -- grass -- rabbit --fox
a deer drinking from a stream
What role do bacteria play in soil ecosystems?
photosynthesis
It flows in one direction
grass
They return nutrients to soil.
greenhouse effect
fixation
Sun -- grass -- rabbit --fox
a deer drinking from a stream
Which process converts atmospheric nitrogen to a from organisms can use?
photosynthesis
It flows in one direction
grass
They return nutrients to soil.
greenhouse effect
fixation
Sun -- grass -- rabbit --fox
a deer drinking from a stream
During which process is oxygen gas released into the atmosphere?
photosynthesis
It flows in one direction
grass
They return nutrients to soil.
greenhouse effect
fixation
Sun -- grass -- rabbit --fox
a deer drinking from a stream
Which organism is a producer?
photosynthesis
It flows in one direction
grass
They return nutrients to soil.
greenhouse effect
fixation
Sun -- grass -- rabbit --fox
a deer drinking from a stream
Which includes both an abiotic factor and a biotic factor?
photosynthesis
It flows in one direction
grass
They return nutrients to soil.
greenhouse effect
fixation
Sun -- grass -- rabbit --fox
a deer drinking from a stream
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