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?

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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