Snowball Earth Pt. 5/5
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Survival of life through frozen periods:
A tremendous glaciation would curtail plant life on Earth, thus letting the atmospheric oxygen be drastically depleted and perhaps even disappear, and thus allow non-oxidized iron-rich rocks to form.
However, organisms and ecosystems, as far as it can be determined by the fossil record, do not appear to have undergone the significant change that would be expected by a mass extinction. Even if life were to cling on in all the ecological refuges listed above, the post-Snowball biota would have a noticeably different diversity and composition. This change in diversity and composition has not yet been observed. In fact, the organisms which ought to be most susceptible to climatic variation emerge unscathed from the Snowball Earth.