Read the following passage: Horses and ponies can be, at times, referred to as the same animal. Although, they are both considered to be equines, and they are similar in many ways, they also have some noticeable differences. One of the biggest, and most obvious differences between horses and ponies is their height. Ponies are much shorter and stockier than horses. However, horses are typically slower growing than ponies, reaching maturity around six or seven years of age, while most ponies are full grown by the time they are three or four. Although ponies are smaller than horses, they are very strong and are able to carry more weight than a horse relative to their size. Both ponies and horses have manes, coats, and tails, but a pony's is much thicker. Horses have had a long career of farming, transportation, and recreation. Historically, they have been used to help farmers plow their fields, to carry people from town to town, and in medieval tournaments. Today, horses are still used for recreation, but they are not used for farming or transportation as regularly as in the past. Some of today's recreational uses include trail riding and racing competitions. Horse owners take care of their horses by feeding them a diet of grass and hay and by housing them in horse stables. Due to ponies' strength, they were often used to move small, but heavy loads from place to place. Today, ponies are commonly seen at birthday parties, petting zoos, and with children riding on their backs. They are often used to help children get comfortable before learning how to ride a full-sized horse. Like horses, ponies also eat a diet of grass and hay; however, they are known to eat twigs, vines, shrubs, and other plants too. Select the phrase that best describes the structure of the text. (2 points) a Cause and effect b Compare and contrast c Chronological order d Problem and solution