Please help !!
Why are high and low tides heights not very different throughout the whole month? give a brief description, thanks

Just as the angles of the sun, moon and Earth affect tidal heights over the course of a lunar month, so do their distances to one another. Because the moon follows an elliptical path around the Earth, the distance between them varies by about 31,000 miles over the course of a month.

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c) both a and b.

the force on the thing and the distance the force moves the thing