As of my last update in late 2023, Donna Lombardi and Kevin Laroy, known from the reality TV series "Black Ink Crew," are not together. The show, which focuses on the daily operations and drama within a Black-owned and operated tattoo empire in Harlem, New York, has showcased a number of personal relationships among its cast. However, Donna and Kevin's interactions on the show have been more professional and friendly rather than romantic. Both have had their share of relationship storylines on the show, but with different partners. It’s important to keep in mind that reality TV can sometimes blur the lines between personal and professional lives, but as per the latest public information, they are not an item.

Polyvinyl chloride, commonly known as PVC, is relatively inert, making it non-reactive under normal conditions. This characteristic is a key reason for its widespread use in construction materials, pipes, and electrical insulation. PVC's chemical stability stems from the strong carbon-chlorine bonds in its molecular structure. However, it's not entirely unreactive. When exposed to extreme heat or certain chemicals, PVC can decompose, releasing hazardous substances such as hydrochloric acid and dioxins. Therefore, while PVC is generally non-reactive and safe for many applications, caution is advised when it is subject to harsh conditions.

To accurately answer how many amino acids were changed, it's essential to clarify the context in which the question is asked, as there are numerous situations where amino acids can be altered. For example, in the study of genetic mutations, amino acid changes can occur through substitutions in an organism's DNA sequence. Such changes can lead to the alteration of a protein's structure and function, potentially causing diseases or contributing to evolutionary adaptations. Additionally, in protein engineering and design, scientists intentionally change amino acids in a protein's sequence to alter its properties or improve its function for various applications, including therapeutics and industrial processes. The exact number of amino acids changed can be determined by comparing the amino acid sequence before and after the mutation or engineering process.