What is the meaning of the word that signifies being present in large numbers or quantities?

The term that signifies being present in large numbers or quantities is "prolific." This word is often used to describe something that reproduces or produces abundantly, whether referring to artists, writers, or even plants and animals. For example, a prolific author may have written many books, while a prolific breeding species can produce a vast number of offspring. This abundance connotation makes "prolific" the correct choice in this context.

The other options relate to different meanings: "atrophies" refers to the wasting away or reduction in size of a body part or tissue, often due to lack of use; "bequest" pertains to something left to someone in a will, commonly relating to money or property; and "nuances" refers to subtle differences or variations in meaning, expression, or sound. Each of these terms does not convey the idea of presence in large quantities, which is why they do not fit the meaning sought in the question.