Pollution has other effects, too. breathing toxic air or drinking polluted water can cause humans and animals to develop health problems that can be serious and sometimes deadly. the deaths of too many members of a certain species of animal can upset the local ecosystem, or the area in which they live. as a result, weather patterns and climates can also changewhich of these would most likely lead to a change in the ecosystem of a certain area?

well stockyards mean a large yard containing pens and sheds, typically adjacent to a slaughterhouse, in which livestock is kept and sorted. and i'm assuming that by party you   mean a large group of people which does make sense because chicago is a very crowded place much like new york. stockyards tend to take up a lot of room due to needing the area for pens to keep animals in and the fact that stockyards are usually right by slaughterhouse where they process and distribute the product. so its much like a zoo but with some dead animal products close by.

d. therefore pilots wisely train these cubs by various strategic tricks to look danger in the face a little more calmly.

c or d they are the same