Encephalization Quotient (EQ) values can be estimated for extinct species because
A) there is a linear relationship between the EQ and time, thus allowing extrapolation
B) extinct species always have the same EQ value
C) by studying their fossilized remains we can estimate their body masses from the size of the remains and their brain masses from the sizes of their cranial cavities
D) we can always find similar species in existence today to make measurements of

Question

Quizplus · Accepted Answer

By studying fossilized remains, scientists can estimate the body masses and brain masses of extinct species, which allows them to calculate their EQ values. This method relies on the assumption that brain size is positively correlated with body size, but it is currently the best way to estimate EQ values for extinct species. There is no linear relationship between EQ and time (A), extinct species do not always have the same EQ value (B), and finding similar species in existence today is not always possible (D).

Encephalization Quotient (EQ) Values Can Be Estimated for Extinct Species