A student is growing sunflower plants in the garden. Each morning, the sunflowers are facing east. At the endof each day,

A student is growing sunflower plants in the garden. Each morning, the sunflowers are facing east. At the end of each day, the sunflowers have turned and are now facing west. What is the best explanation for the
observations?
The wind changes direction, turning the plant.
The plant is responding to the location of the sunlight.
The roots of the plant are growing downward, responding to gravity.
The leaves are wilting due to the lack of water

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