Environmental Science
Which of the following gases are mainly responsible for the atmospheric greenhouse effect in the earth's atmosphere?

Nitrogen and carbon dioxide
Water vapor and carbon dioxide
Ozone and oxygen
Oxygen and nitrogen

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Environmental Science
A food web is

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

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