The seasons of the Earth are caused by:

As the earth spins on its axis, producing night and day, it also moves about the sun in an elliptical orbit that requires about 365 1/4 days to complete. The earth's spin axis is tilted with respect to its orbital plane. This is what causes the seasons.

Explanation:

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he plasma membrane is selectively permeable and regulates which molecules are allowed to enter and exit the cell. hope this helped!