Final answer:
Polyunsaturated fatty acids have non-linear structures due to multiple double bonds, while saturated and monounsaturated fatty acids have linear structures.
Explanation:
Polyunsaturated fatty acids have more than one C=C double bond, making their structure non-linear. On the other hand, saturated fatty acids have all single bonds, resulting in a linear structure.
In comparison, monounsaturated fatty acids have only one C=C double bond, still maintaining a linear structure similar to saturated fatty acids.
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