Environmental Science
Carbon dioxide is called greenhouse gas because it is

Transparent to both sunlight and heat
Used in green-house to increase plant growth
Transparent to sunlight but traps heat
Transparent to heat but traps sunlight

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Environmental Science
Which one is true?

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

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