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Pesquisadores identificaram mais de 12 mil fósseis microscópicos em rochas do Território do Norte, na Austrália, com idade entre 1,4 e 1,7 bilhão de anos. O estudo, de Maxwell Lechte e Leigh Anne Riedman, foi publicado na Nature e reúne alguns dos eucariontes mais antigos já encontrados. O mapeamento mostra que essas células ocupavam desde planícies de lama costeiras até o mar aberto, mas apenas em águas oxigenadas. Nos ambientes sem oxigênio havia somente proc
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