Marking !
a reference within a text to another text is called a(n)

prologue
epigraphic reference
epilogue
allusion

Desalination is expensive because it requires

Which statement is the best summary of the theme in this passage? people almost always disappoint their family members. working hard and being honest leads to long-lasting rewards. showing strength in a crisis makes problems easier to overcome. unintentional betrayal can lead to severe consequences

Accepted is to fact as unproven is to