Which of these statements is true about the oxygen revolution? . a. cyanobacteria were the first organisms to introduce oxygen into the atmosphere.. b. protocells were the first organisms to produce oxygen in water, which then escaped into the atmosphere.. c. cyanobacteria were the first organisms to produce oxygen in water, which then escaped into the atmosphere.

they each offer a fresh glut of resources to the organisms that can arrive and exploit them. as individuals and new species continue to appear, they actively and passively alter the environment. competition for shared resources increases, local abiotic and biotic conditions shift, and the relative abundances of species change accordingly. the process is called ecological succession, and it is one of the earliest and most well-known concepts in ecology.

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