schoolgirl conducts experiments chemistry lesson the girl compares two test tubes with colored liquids |
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| navigate by keyword : schoolgirl girl conducts experiments chemistry lesson pouring colored liquids beaker class biotechnology childhood knowledge education science study scientific fun cognition school chemical laboratory equipment test tube elementary learning classroom scientist chemist small little caucasian flask student joyful research biology primary curiosity dripping analyzing dropper fluid reagent substance subject smart pupil |
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| A schoolgirl conducts experiments in a chemistry lesson. The girl compares two test tubes with colored liquids |
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