Final answer:
Based on the graph showing the survival rates of flightless Mormon crickets, crickets that move in large groups have a higher survival rate compared to those moved away from groups.
Step-by-step explanation:
Based on the given scenarios, we can infer that flightless Mormon crickets that move in large groups have a higher survival rate compared to those that move away from groups. This is because social behavior like migrating in large groups can improve chances of survival by, for example, reducing predation or increasing the likelihood of finding food. The example of voles teaches us that when food becomes scarce or predation increases, those that migrate or exhibit different behaviors to adapt might have a better chance of survival, affecting the genetic variation in future generations. Likewise, selective pressures, such as the necessity to escape predators or withstand cold temperatures, can lead to morphological changes in a population, as explained with the rodent population near the Arctic Circle.