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PLEASE HELPP❤️❤️❤️ Biology question 9th grade 5 points I really need help Check the picture for the question
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Biology question 9th grade 5 points I really need help

Check the picture for the question

PLEASE HELPP❤️❤️❤️ Biology question 9th grade 5 points I really need help Check the-example-1
User Stanley Cheung
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The answer is A. Each channel accepts only one type of molecule to pass through
User Rodion Mostovoi
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