Scientists think that algae first evolved approximately 2.7 billion years ago, and soon after this oxygen began to exist in the atmosphere. Photosynthesis by primitive plants and algae released oxygen, which gradually built up in the atmosphere.
Explanation:
Answer:
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Stone, Stick and Shell Symbols <span>represent Mayan numerals.</span>
I don’t understand the question..
Gitanos means gypsies in Spanish.
