(1) The only marsupial native to North America is the Virginia opossum. (2) Like all opossums, it crawls into its mother’s pouch shortly after birth. (3) There, it is nourished until it is about 10 weeks old. (4) A newborn opossum is extremely helpless. (5) It is very small. (6) It is furless. (7) It is sightless. (8) Though youngsters leave the pouch after about 10 weeks, they continue to follow their mother on feeding expeditions for some time. Which is the most effective way to vary the length of the sentences in the passage?