Environmental Science
Definition of ecosystem is

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

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Environmental Science
Which one is true?

symbiosis when neither population affects each other
commensalism when none of the interacting populations affect each other
symbiosis when the interaction is useful to both the populations
commensalism when the interaction is useful to both the populations

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Environmental Science
How do red and blue light differ?

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

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