Most people have wondered about the differences between horses and zebras. To understand the difference, you must first understand exactly what a horse is. The horse is a hoofed, plant-eating mammal of the family Equidae. This family includes domestic horses, wild horses, and zebras. All are swift, plains-dwelling herd animals who eat coarse grass. Horses, as we know them, evolved in North America and spread over the world. They were hunted by early humans and put to work by Asian nomads. Until the mid-20th century, horses were widely used for warfare, agriculture, and transportation. Today, most horses are used for farming purposes. Few modern horses roam wild.
On the other hand, most zebras live in open plains or brush country. Mountain zebras like rocky hillsides. Zebra herds on the Serengeti of East Africa can be as large as 200,000 zebras. All travel in family groups led by a stallion. The plains zebras usually mix with other grazing animals, such as wildebeest and antelopes.
You would have to look at the DNA of horses and zebras to understand their physical differences. Zebras and horses have very similar bodies except for their skins!

Which of the following helps the reader understand how the passage is organized?
A.
"On the other hand. . . ."
B.
". . .you must first understand. . . ."
C.
"Most people have wondered. . . ."
D.
"Few modern horses roam wild."

Ineed . read this textbook passage. select the five (5) statements which are most logically supported by the given information. what would you do if you won ten million dollars in a lottery? your first reaction might be, “i’d spend the rest of my life on the beach (or skiing or traveling).” but in all likelihood you, like most other people who receive financial windfalls, would seek some kind of work eventually. a variety of motives keeps people working, even when they don’t need a paycheck to survive. if you’ve ever worked as a volunteer, you know that someone can be more satisfying than receiving pay. work also provides a sense of identity. one man aged 81 said, “i’ve been in the fabric business since i was a kid, and i still get a kick out of it." studies suggest that rats, pigeons, and children sometimes work to gain rewards, even if they can get the same rewards without working. one researcher wrote the following on the subject: rats will run down an alley tripping over hundreds of food pellets to obtain a single, identical pellet in the goal box, . . and pigeons will peck a key . . to get exactly the same food that is freely available in a nearby cup. given the choice of receiving marbles merely by waiting a certain amount of time for their delivery, children tend to prefer to press a lever . . to get the same marbles. 1. serving a purpose is satisfying. 2. it is not so lucky to win a large amount of money in a lottery. 3. endless “vacationing” eventually becomes dissatisfying. 4. the pay we receive is unimportant. 5. most people try to work as little as possible. 6. people, rats, and pigeons enjoy the challenges and interaction that work offers. 7. it generally feels better to achieve something than to be given something. 8. people who don’t retire continue to work only because they need the money. 9. most people who work as volunteers resent the fact that they are not paid for their work. 10. work can be its own reward.