Last Updated：2025/12/29
Sentence
That
the
habitability
of
our
planet
was
severely
endangered
by
the
significant
rise
in
oxygen
levels
and
reduction
in
methane
due
to
oxygen-producing
bacteria
combined
with
the
low
luminosity
of
the
Sun
in
the
Proterozoic
era
(2500–
542
million
years
ago)
is
suggested
by
geological
evidence
for
severe
global
glaciations
in
this
epoch.
Quizzes for review
That the habitability of our planet was severely endangered by the significant rise in oxygen levels and reduction in methane due to oxygen-producing bacteria combined with the low luminosity of the Sun in the Proterozoic era (2500– 542 million years ago) is suggested by geological evidence for severe global glaciations in this epoch.
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