I need help with the grammar of this sentence from a light novel:
短い黒髪に、高くも低くもない平均的な身長。
1. What is the purpose of に after 黒髪? Is it a conjunction particle?
2. Does the く after 高 and 低 make them adverbs? If so how does it affect the verb です (which I assume is the implied verb)
3. I don't understand the use of もない in the sentence