Critical Reasoning (CR) | Re: Networks of blood vessels in bats' wings serve only to

In case of A, I am not clear how can we assume that the function of networks of blood vessels inBat's wings is SAME as the function of networks of blood vessels inDino's wings ! It may happen that networks of blood vessels inBat's wings are used for onlyto disperse heat generated in flight, whereas networks of blood vessels inBat's wings are used for onlyto circulate blood or anything else .

Would you please help me to get out of it?