Full access allows:
- Solve all tests online without limits;
- Remove all advertisements on website;
- Adding questions to favorite list;
- Save learning progress;
- Save results of practice exams;
- Watching all wrong answered questions.
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4. Какой газ мы вдыхаем для поддержания жизни?
Кислород необходим для процесса дыхания клеток.
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