The correct answer for the question that is being presented above is this one: "oxygen became available from cyanobacteria." About 1.2 billion years ago, eukaryotic and multicelled organisms evolved because oxygen became available from cyanobacteria.
An archipelago...........
The hawaiian islands are north of the equator
Answer:
Physical regions are defined by landform (continents and mountain ranges), climate, soil, and natural vegetation.
Explanation:
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