Where on earth did life begin and what were the special conditions needed?

Earth was formed over 4.5 billion years ago meaning this world looked completly different from how it looks now. volcanic outgassing most likely created the world (but it's still uncertain). the earth began in the ocean and arose from there. the early atmosphere contained almost no oxygen until later in the years, building up oxygen. The earth contained a diveristy in chemicals.

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a. decomposes use carbon from dead organisms as fuel for cellular respiration, returning carbon dioxide back into the atmosphere.