Environmental Science
One greenhouse gas contributes 14% to total global warming and another contributes 6%. These are respectively identified as

CFCs and CO2
CFCs and N2O
N2O and CO2
Methane and CO2
Methane and CFCs

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Environmental Science
A food web is

Like a food chain
The tropic (feeding) levels that can be observed in an ecosystem
The set of prey species that are consumed by animals in an ecosystem
A set of interconnected food chains, illustrating the tropic relationships among species

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