Chapter VI · VERTEBRATES (continued 2)
Reading edition
What is accomplished by having two bones in the shank of the leg? In what types or forms is there but one, and which one is it?
Can you assign any advantages in power, agility, length of leg, or position of leg and foot accruing from a long ankle? (See horse, frog, et al.)
Enumerate the types or forms, and opposite each state the number of fingers and toes.
Make a table, heading one column "Form or type"; another, "Habitat"; and a third, "Habit." Judging from the structure which you see or from your previous knowledge or experience, fill in the table, stating whether the type is aquatic, terrestrial, or aërial; whether it burrows, walks, runs, or climbs, etc.
From your statements in 15, explain how the peculiar mode of life affects the structure of these types.