Answer:
They make challenging concepts easier to understand.
They illustrate complex concepts that are hard to picture.
They increase the level of interest in the information.
Explanation:
Rain: connotation is that of abundance, overabundance, or just sheer magnitude. ... The second connotation is sadness, melancholy, distress, or even foreboding. Use of rain or impending rain in movies to convey such these things is almost a trope.
The direct object in the sentence is passengers.
Direct Object follows a transitive verb and answers to the question who or what. It can be a noun, pronoun, phrases, or clauses.
Subject = sailors
Transitive verb = rescued
sailors rescued who? - passengers - direct object.