.
One every other day.
One each day.
Two each day.
It cannot be predicted.
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Image A
Image B
Image C
Image D
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April 2
April 4
April 6
April 8
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Neap high tide.
Neap low tide.
Spring high tide.
Spring low tide.
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Earth's gravity alone.
The Moon's gravity alone.
The Sun's gravity alone.
The gravity of the Moon and the Sun.
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