You can look up the answer and that could help you :), or I like to check back into the book for answers
Do you mean synonyms to the word dark that are also nouns?
Charcoal and Raven
Answer:
The storm clouds from the east had finally rolled onto the ranch. The ominous clouds took it’s place before the sky as the floodwaters of the heavens opened up to release the heavy droplets we know as “rain”. Soon ever blade of grass and every leaf from the tall oak trees were drenched in heavy rain. All the vegetation was struggling to stay up as the overbearing rain drops crushed them down. The night dragged on and with the passing of time brought the booming of thunder. Powerful bursts of Light streamed across the sky in an almost angery sort of way as the winds carried stray leaves and nearby rubbish into the unknown. The storm plowed on until the ranch was completely flooded. The vegetation was ruined and torn apart, the trees had lost many leaves from the powerful wind, and all the animals of the ranch were nowhere to be found. This stormy night had no mercy for the ranch.
hope this helps sorry it took so long to write and think of a good little story! :D
Answer:
D: communities that use the latest digital technology, particularly computer systems that respond to input from networks of sensors, to deliver city services efficiently and improve urban life
Explanation:
This links back to the main idea of the passage and the writer wants a sentence in order "to help clarify the central concept of the essay."