What was the problem with polio vaccine? how did hela solve this problem?

Which of the following is a characteristic of theme? a. it is the same as a moral b. it runs throughout a text c. it exist only in literature d. it is unique to each piece of work

The tankers are so large how did some crew members get from one point to another while on board

The moutain stood shoulder to shoulder and glared down at the pasture below, daring anyone to approach. what is the most likely the intent of the author's word choice in this sentence?