Bean seeds were planted and put on a sunny windowsill. As the plants grew, their stems bent toward the window. This bending was

Bean seeds were planted and put on a sunny windowsill. As the plants grew, their stems bent toward the window. This bending was most likely caused by an
A. unequal distribution of auxin in the stem
B. unequal distribution of a neurotransmitter in the stem
C. equal distribution of auxin in the stem
D. equal distribution of a neurotransmitter in the stem

Bean seeds were planted and put on a sunny windowsill. As the plants grew, their stems bent toward the window. This bending was most likely caused by

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