reproduction and death is correct because words opposed to each other means a pair of words or ideas that are opposite or strongly contrasting in meaning.

This idiom or phrase is useful because it helps students understand the intended meaning beyond the individual words.

Examples: Life and death are words opposed to each other. Victory and defeat are also opposed to each other in meaning.

Hopes and aspirations and heat and warmth are close in meaning, while bullets and bayonets are related objects.