Environmental Science
Definition of ecosystem is

The community of organisms together with the environment in which they live
A community of organisms interacting with one another
The part of the earth and its atmosphere which inhibits living organisms
The abiotic component of a habitat

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Environmental Science
How do red and blue light differ?

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

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