Environmental Science
Our seasons are caused by:

The angle at which sunlight reaches the earth
The length of the daylight hours
The changing distance between the earth and the sun
All of these
Only (b) and (c) are correct

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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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