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Sunflower heliotropism

Sunflower heliotropism

solar tracking by aerial portions of the plant

en-GB/ˈsʌnflaʊə hiːliːəʊtɹəʊɪzəm/

en-US/ˈsʌnˌflaʊɚ ˌhiliˈɑtɹəˌpɪzəm/

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