State the term given to the structure shown in figures given below?

(a) State the term given to the structure shown in figures given below ?
(b) State the evolutionary evidence obtained from such structures.

© Why are traits acquired during the lifetime of an individual not inherited ?

(a) Homologous organs:
Basic structures of limbs same, functions different.
(b) The similarities indicate that all these vertebrates had common ancestors.
© Change in non-reproductive tissues cannot be passed to germ cells.