Final answer:
Weight and height are most likely to be related in humans, with taller individuals typically weighing more than shorter individuals.
Step-by-step explanation:
From the data presented in Figure 18.12, we can see that weight and height are most likely to be related. Generally, taller individuals tend to weigh more, while shorter individuals tend to weigh less. This is because larger bones in taller individuals require more flesh to fill out their frames. However, it's important to note that there is a wide range of variation and exceptions to this rule.