In a Comparison of Birds and Mammals, Having Four Limbs

question 45

Multiple Choice

In a comparison of birds and mammals, having four limbs is

• A) a shared ancestral character.
• B) a shared derived character.
• C) a character useful for distinguishing birds from mammals.
• D) an example of analogy rather than homology.
• E) a character useful for sorting bird species.

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Definitions:

Neutral Plane

The region in a rotating electrical machine where the magnetic field does not induce any electromotive force in the armature.

Synchronous Winding

A winding configuration in an electric machine that operates at a speed directly proportional to the frequency of the electric power supply.

Repulsion Motor

A type of single-phase motor that uses repulsion of magnetism to operate.

Magnetic Poles

The regions at the ends of a magnet where the magnetic field is strongest, designated as north and south poles.