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Hiw do the muscles that operatr the rear likbs of the cat diffrer from those of...

Hiw do the muscles that operatr the rear likbs of the cat diffrer from those of the necturus and what evolutionay changes were nesseasry to drive these diffrenences?

How do the muscles that opereate the rear limb of the cat differ from those of the necturus and what evolutionary changes were necessary to drive these diffrences?
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In case of cats,rear limb muscle length ranges from 28.3 to 144 mm whereas fiber length ranges from 8.4 to 105.5 mm. I.e.,fiber to muscle length ratio were similar throughout a muscle.Necturus is a genus of aquatic salamanders.They are commonly known as mud puppies.They are moderately robust and have 2 pairs of short but we'll developed limbs.protractor(moves limb forward),and Retractor(moves limb backward).The segmented origin of muscles can be easily traced in case of mudpuppies but in case of mammals like cat,it becomes obscured by massive limb muscles.

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