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"More than 3.5 billion years ago, small single-celled organisms acquired the capacity to photosynthesize" "Plants were restricted to the aquatic world until three billion years later, the first uncontroversial evidence for life is found 2,700,000,000 years ago.

The reference relates to sulphate and iron reduction as early forms of microbial respiration.

Nor is it clear whether it concerned two sharp mass extinctions or a series of smaller extinctions, though the latest research suggests multiple causes and a series of distinct extinction pulses through an interval of some three million years.Some plants are parasitic and have lost the ability to produce normal amounts of chlorophyll or to photosynthesize.Plants are characterized by sexual reproduction and alternation of generations, although asexual reproduction is also common.Euramerica and Gondwana were beginning to converge into what would become Pangaea.The extinction seems to have only affected marine life.

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