David C. Catling Evolution QuotesDavid C. Catling However life started, once established, it persisted for over 3.5 billion years and evolved from microbial slime to the sophistication of human civilization. David C. Catling BestQuotes4Ever.com However life started, once established, it persisted for over 3.5 billion years and evolved from microbial slime to the sophistication of human civilization. |
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