Which statement correctly assigns fixed and varying evidence derived from skeletal remains?

Which statement correctly assigns fixed and varying evidence derived from skeletal remains?

• A. Height and age are fixed; sex and ancestry are varying
• B. Diet and illness are fixed; height is varying
• C. Sex and ancestry are fixed; height and age are varying
• D. Eye color and hair type are fixed; bone length is varying

Answer: (C)

The main idea here is that some skeletal traits are considered fixed once development is complete, while others are estimates that can vary with interpretation or condition of the remains. Sex and ancestry are determined by genetic and developmental factors reflected in the bone; once bones form, these attributes do not change, so they’re treated as fixed characteristics. Height and age, on the other hand, are reconstructed from measurements and contextual information and come with uncertainty—height is inferred from long-bone lengths using population-specific formulas and can vary with measurement error or proportion, while age is often estimated and expressed as a range or approximate figure, not an exact value. So the statement that sex and ancestry are fixed while height and age are varying matches how skeletal evidence is typically interpreted. The other options misclassify these attributes (for example, diet and illness aren’t fixed skeletal attributes, and eye color or hair type aren’t reliably derived from bones), which is why they’re not correct.

The main idea here is that some skeletal traits are considered fixed once development is complete, while others are estimates that can vary with interpretation or condition of the remains. Sex and ancestry are determined by genetic and developmental factors reflected in the bone; once bones form, these attributes do not change, so they’re treated as fixed characteristics. Height and age, on the other hand, are reconstructed from measurements and contextual information and come with uncertainty—height is inferred from long-bone lengths using population-specific formulas and can vary with measurement error or proportion, while age is often estimated and expressed as a range or approximate figure, not an exact value.

So the statement that sex and ancestry are fixed while height and age are varying matches how skeletal evidence is typically interpreted. The other options misclassify these attributes (for example, diet and illness aren’t fixed skeletal attributes, and eye color or hair type aren’t reliably derived from bones), which is why they’re not correct.