Final answer:
Based on the educational resources like Figure 10.1, which describe the destructive power of tornadoes, a cow is not mentioned as an object typically thrown by tornadoes, unlike cars, trees, and houses.
Step-by-step explanation:
When considering the scenario of Bill and Jo meeting up with a big EF-5 tornado, describing objects that might be thrown at them or appear in their way, it is important to draw from sources of information that talk about typical debris in such events. Referring to descriptions found in various figures, such as Figure 10.1, we learn that tornadoes are capable of lifting heavy objects including cars, trees, and even pieces of houses. However, the item not thrown at them among the options given would be a cow. Considering the destructive power of tornadoes as depicted in Figure 10.1, we understand that they can indeed blow houses away and carry extremely heavy items, but a cow is not specifically mentioned in this educational context.