Environmental Science
Biogas is composed of

ethane, carbon dioxide, nitrogen and hydrogen
methane, carbon dioxide, nitrogen and sulphur
methane, carbon dioxide, nitrogen and hydrogen
carbon dioxide, nitrogen and hydrogen

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Environmental Science
In the food relationship where the lion eats the wild beast, and the wild beast eats plants

The lion is the primary consumer and the wilde beast is the secondary consumer
The lion is the secondary consumer and the wilde beast is the primary consumer
The lion is the prey and the wilde beast is the predator
The lion is the predator and the wilde beast is the prey

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