In many languages other than English there is a word for "mother's brother" which is different from the word for "father's brother," whereas English uses the word "uncle" for both.
Conclusion (therefore)
Speakers of languages that have fewer basic words for colors than English has must be perceptually unable to distinguish as many colors as speakers of English can distinguish.
Evidence
The number of basic words for colors varies widely from language to language.
Evaluate
The author seems to be thinking that, .
But I might be able to distinguish 10 different shades of blue, even though my simplified color language might make me call them all "blue".
Goal
We want an answer to help us argue that, , or to argue that .