Limbs of a frog, lizard, bird, human are
homologous
The correct option is B.
Explanation of the correct option:
Explanation of the incorrect options:
Option A:
Organs or structures that differ in origin and structure but have the same function are called analogous organs or structures.
Option C:
Homologous organs or structures cannot be analogous and vice versa.
Option D:
Limbs of frogs, humans and lizards are used to walk on land.
Final answer: The limbs of a frog, lizard, bird and human are homologous.