The greenhouse effect.
Hope this helps!
-Payshence xoxo
A community is where a group of people live really close by vs. a population counts how many people live in a area
The answer is: "2A" or "IIA" or "2" or "II";
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In which "II" stands for the Roman numeral representing the number: "2 (two)".
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1- Paleozoic era
2- mesozoic era
3- Cenozoic era