Analogous Structures. These are the saber teeth of Thylacosmilus and Smilodon. Both have saber teeth but they do not share an ancestor. Thylacosmilus is a marsupial and Smilodon is a mammal.
Analogous traits are traits shared by different species having a similar function but not acquired from a common ancestor.
In this case, the Thylacosmilus and Smilodon have a similar trait, which is saber teeth. It is given that saber teeth are not found in the ancestors of the Thylacosmilus and Smilodon. So, this trait is evolved differently in both the organism, but share the same function.
Total Lung Capacity(TLC) is the maximum volume of air the lungs can accommodate or sum of all volume compartments or volume of air in lungs after maximum inspiration.