darkpain4371
01.12.2020 •
Biology
What does 20-20-20 mean??
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Ответ:
Like after 20 min on a screen, look 20 feet away for 20 seconds
Ответ:
46.6% Oxygen (O)
27.7% Silicon (Si)
8.1% Aluminum (Al)
5.0% Iron (Fe)
3.6% Calcium (Ca)
2.8% Sodium (Na)
2.6% Potassium (K)
2.1% Magnesium (Mg)
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