Environmental Science
The organic matter produced by the photosynthetic activity of green plants is called as

cellular process
light energy
energy flow
primary productivity

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Environmental Science
When clouds are viewed near the horizon, the individual cloud elements usually:

Appear lighter in color than is actually the case
Appear to have more vertical development than is actually the case
Appear farther apart than is actually the case
Appear closer together than is actually the case

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Environmental Science
Which one is true?

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

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