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The transition from aquatic to terrestrial lifestyles required many adaptations in the vertebrate lineage. Which of the following is not one of those adaptations ?

A. Switch from gill respiration to air-breathing lungs.

B. Improvements in water resistance of skin.

C. Alteration in mode of locomotion.

D. Development of feathers for insulation.

Please do not use chat terms. Example: avoid using "grt" instead of "great".