Final answer:
Native upland game birds are characterized by being large in size, ground-dwelling, having a thick neck and short rounded wings, and being strong flyers with short flights close to the ground.
Step-by-step explanation:
Two characteristics of a native upland game bird are: they are usually a large size, and they spend a significant amount of their time on the ground. Upland game birds, like chickens and turkeys (which are types of landfowl), typically exhibit a thick neck and short, rounded wings.
Their flight is generally brief and remains close to the ground, making strong flyers and ground-dwelling accurate descriptions of these birds. Thus, the correct answer to the list of characteristics for a native upland game bird is B. Ground-dwelling and strong flyers.