Identify the period, when the earliest forms of life were thought to have originated on earth. Select one: a. 3.2 Billion years ago b 4.6 Billion years ago c. 4 Billion years ago d . 3.5 Billion years ago

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Identify the period, when the earliest forms of life were thought to have originated on earth. Select one: a. 3.2 Billion years ago b 4.6 Billion years ago c. 4 Billion years ago d . 3.5 Billion years ago
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