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The key event in the transition of the amphibia... - JAMB Biology 2017 Question

The key event in the transition of the amphibians from water to land is the ________
A
replacement of the gills with lungs
B
possession of webbed limbs
C
limbs
D
possession of tympanic membrane
correct option: a
Amphibians display some interesting and changing characteristics as they metamorphose through various forms on their way to adulthood. The frog, for instance, begins life underwater as a larva with gills and becomes and air-breather with lungs as an adult.
&therefore4; in case of draught, frog can amphibians can use lungs to breathe on land
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