Question

teams, took turns running the various legs of the journey from nome to nenana, where they would receive the serum, then back home to nome with the medicine. (4) when the gauntlet was passed to leonhard seppala and his lead dog, togo, the conditions were especially dark, and the weather was extremely dangerous. (5) leonhard seppalas own child had been exposed to the disease, and he was determined that there would be no delay in the delivery of the medicine. (6) seppala and his team braved the most arduous leg of the journey, traveling as fast as they could through the night. (7) leonhard seppala went on to become the greatest \musher\ in history. (8) his love and passion for sled dogs is memorialized by the leonhard seppala humanitarian award, the award granted for excellence in sled dog care and ownership. (9) many, though, believe that seppala and togo were the true heroes of that lifesaving mission. (10) much which transition word or phrase should be placed at the beginning of sentence 5? after all, in fact, however, previously, save and continue >

Explanation:

Sentence 4 describes difficult conditions, and sentence 5 shows Seppala's determination despite them. "However" is used to contrast the challenging situation with his resolve.

Answer:

However