Question

the root fic or fac means do or make. what does the word prolific mean? helpful or cooperative careful or precise productive or fruitful expressive or well - spoken

Explanation:

The prefix "pro -" often means forward or a lot. Combining with the root "fic/fac" (do/make), "prolific" implies doing or making a lot, which means productive or fruitful.

Answer:

productive or fruitful