Last Updated：2025/12/20
Sentence
Oxygen
levels
on
Earth
skyrocketed
2.4
billion
years
ago,
when
cyanobacteria
evolved
photosynthesis:
the
ability
to
convert
water
and
carbon
dioxide
into
carbohydrates
and
waste
oxygen
using
solar
energy.
The
evolutionary
precursor
of
photosynthesis
is
still
under
debate,
and
a
new
study
sheds
light.
Quizzes for review
Oxygen levels on Earth skyrocketed 2.4 billion years ago, when cyanobacteria evolved photosynthesis: the ability to convert water and carbon dioxide into carbohydrates and waste oxygen using solar energy. The evolutionary precursor of photosynthesis is still under debate, and a new study sheds light.
音声機能が動作しない場合はこちらをご確認ください
English - English
Word Edit Setting
- Users who have edit permission for words - All Users
- Screen new word creation
- Screen word edits
- Screen word deletion
- Screen the creation of new headword that may be duplicates
- Screen changing entry name
- Users authorized to vote on judging - Editor
- Number of votes required for decision - 1
Sentence Edit Setting
- Users who have edit permission for sentences - All Users
- Screen sentence deletion
- Users authorized to vote on judging - Editor
- Number of votes required for decision - 1
Quiz Edit Setting
- Users who have edit permission for quizzes - All Users
- Users authorized to vote on judging - Editor
- Number of votes required for decision - 1
