[求助]11thOG-89

woodsender

Evidence:

the winged dinosaur Sandactylus had similar networks of blood vessels in the skin of its wings

Conclusion：

Sandactylus flew by flapping its wings, not just by gliding

Assumption:

to justify the above evidence is valide, so S network is in use " Sandactylus would not have had networks of blood vessels in the skin of its wings if these networks were of no use to Sandactylus."

sausau

同错

dldennis

dldennis

lucky_fs

同错，不理解，顶起来