Environmental Science
Which one is true?

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

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Environmental Science
When a liquid thermometer is held in direct sunlight,

It will measure a much higher temperature than that of the air
It will measure the temperature of the sun rather than the air
It will accurately measure the air temperature
It will measure a much lower temperature than that of the air

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