What May Have Been the "Reason" for the "Cambrian Explosion

question 75

Short Answer

What may have been the "reason" for the "Cambrian explosion"?

Explain the proper methods of attaching fifth-wheel base plates to truck frames.

Understand the role of the upper coupler in the truck-trailer connection.

Identify the SAE standard sizes for kingpins.

Acknowledge the necessary conditions for correctly coupling a tractor's fifth wheel to a trailer's upper coupler.

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Definitions:

Labor Cost Variance

The difference between the actual labor costs incurred and the standard labor costs for the actual production achieved; it is used for monitoring labor performance.