What happens when animals become a part of an urban ecosystem

Urban ecosystem, any ecological system located within a city or other densely settled area or, in a broader sense, the greater ecological system that makes up an entire metropolitan area. The largest urban ecosystems are currently concentrated in Europe, India, Japan, eastern China, South America, and the United States, primarily on coasts with harbours, along rivers, and at intersections of transportation routes. Large urban areas have been features of the industrialized countries of Europe and North America since the 19th century. Today, however, the greatest urban growth occurs in Africa, South and East Asia, and Latin America, and the majority of megacities (that is, those with more than 10 million inhabitants) will be found there by 2030.

Urban ecosystem, any ecological system located within a city or other densely settled area

Your answer here is d