[Ira_Louvin]

“The most amazing fact about the evolution of flight is the extent of convergent evolution between the three main groups that evolved it (again, the pterosaurs, birds, and bats). In this convergence, we can see some semblance of general “rules” that may govern how animals evolve flight, and from these rules we can perhaps glean a hint of what it takes for an animal to have potential for flight.”

This link should help you out with that question.

http://www.ucmp.berkeley.edu/vertebrates/flight/evolve.html

[Cedric]

“In this convergence, we can see some semblance of general “rules” that may govern how animals evolve flight, and from these rules we can perhaps glean a hint of what it takes for an animal to have potential for flight.”

semblance

general

may

perhaps

glean

hint

potential

That was or might have possibly perhaps sort of been or could be a really or somewhat great answer or not.