6. Which ideas are most clearly contrasted in this excerpt?
A. love and hate
B. youth and experience
C. fear and fearlessness
D. loneliness and sense of belonging

The reversalists continue their labors, confident that they will one day construct an engine that generates more compression than it uses, a perpetual power source that will restore to the universe its lost vigor. which theme is best supported by the excerpt? a. scientific study requires dedication and perseverance. b. people will always look for a way to achieve immortality. c. death must always be endured alone. d. change is difficult to accept but beneficial if embraced.