Read the passage and answer the following questions:
There were three animals: A, B and C. Animal A can fly but animal B can only run on ground or walls. However, the forelimbs of animal A and B, both have the same basic design but they were used for different purposes such as flying and running respectively. The animal C became extinct a long time ago. The study of fossils of animal C tells us that it had some features like those of A and some like those of B. In fact, animal C is said to form a connecting link in the evolutionary chain of A and B.
Q. _____________ name is given to the forelimbs like those of A and B, which have the same basic design but different functions?