The wing of a bat, the hand of a human, and the flipper of a dolphin show similar bone structures, but these structures are used quite differently. most scientists believe that these structures started out the same, but changed over time. what is most likely to have driven these changes?

The changes in their structure occurred through the process of artificial selection because these structures though started from the similar bone structure deviated from their basic structure when the ecological conditions and surrounding around them changed which put same form of structure into various use due to which these evolved differently.

the answer is yes, they are born/created, then they grow to their limit then produce offspring, then die.