Answer the following question, with explanation first.
Some aviary species fly and others swim but, all endothermic tetrapod vertebrates share what trait?\nOptions:\n- (A) warm-blooded\n- (B) Weight\n- (C) fur and fat\n- (D) sweating\n- (E) Epidermis\n- (F) feathers\n- (G) retina\n- (H) four limbs

(F)
Birds are endothermic tetrapod vertebrates.

Some birds fly and some birds swim, but all birds have feathers.

Some aviary species fly and others swim but, all are endothermic tetrapod vertebrates.

.

Final answer: (F)