The animals listed in the table below were grouped together because they share certain characteristics.What would be the appropriate heading for this grouping? 
Definitions:
Specification Load
A defined weight or pressure that a structure, machine, or component is designed and built to support or carry.
Three-Element Frame
A type of vehicle frame comprising three main elements, offering a balance of flexibility and rigidity to support various mechanical components.
Section Modulus (SM)
A geometric property of a cross-section used in engineering to design for bending, indicating the strength of a beam or structural member.
Hardened Steel
Steel that has been treated through a heating and cooling process to increase its hardness and strength, making it resistant to wear and tear.
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