What is the primary reason the popular culture depiction of *Liopleurodon* exceeding 80 feet makes its speed implausible?

Answer

Maintaining speed at that unrealistic mass would require phenomenal power, leading to a ponderous movement

The physics of moving an 80-foot mass require immense power; the sheer scale mandates a slow, ponderous movement compared to the actual, smaller fossil estimates.

What is the primary reason the popular culture depiction of *Liopleurodon* exceeding 80 feet makes its speed implausible?
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