the other hand, the wings of birds and the foreleg of a frog are homologous structures (although these limbs have different functions, their embryonic origins are similar).
(these limbs; have; different functions) (their embryonic origins; are; similar) Context(their embryonic origins are,List([135, 162))):(the wings of birds and the foreleg of a frog; are; homologous structures)
their embryonic origins are,List([135, 162))
these limbs their embryonic origins the wings of birds and the foreleg of a frog
have are are
different functions
similar
homologous structures