Environmental Science
How do red and blue light differ?

Blue light has a higher speed of propagation.
The wavelength of red light is longer.
Red light has a higher intensity.
Red and blue light have different directions of polarization.

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Environmental Science
Biogas is composed of

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

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