GMAT Critical Reasoning (CR) | Networks of blood vessels in bats’ wings serve only to dispe

"the hypothesis thatSandactylus flew by flapping its wings , not just by gliding"

E already supports this conclusion. In other words, negating E would not break the above hypothesis.

The argument in propositional logic:

P1. For all Bats, BV (Blood Vessels) -> Dissipate Heat
P2. For all Bats, Heat -> Flap Wing

Hypothesis: Sandactylus, BV, Flap Wing?

From P1 & P2 and using transitive inference,
For all Bats, BV -> Flap Wing

For above to work for Sandactylus too, we need:
P1S.
...

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