[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.

[Ira_Louvin]

So what hypothesis do you propose, and what falsifiable evidence do you have to support it?