Environmental Science
Of the gases listed below, which is not believed to be responsible for enhancing the earth's greenhouse effect?

Molecular oxygen (O2)
Carbon dioxide (CO2)
Chlorofluorocarbons (CFCs)
Nitrous oxide (N2O)
Methane (CH4)

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Environmental Science
A food web is

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

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