Do you think it is a natural behavior for people to sort and categorize the things and people they encounter in their lives? If so, when might it be useful? When does it become a problem?

Yes, it is completely natural for people to categorize and sort things according to their degree of similarities.

This ability is what helps the mind learn easily, predict, and by extension, plan effectively.

Sorting and categorization into groups of similar persons and or items also has the advantage of language formation, understanding, and communication. It is also useful for helping with drawing inferences.

This ability, as with everything in life, is not without its demerits.

When applied inflexibly to human beings, it results in the error of generalization or stereotyping.

Stereotyping is a permanent perception that a person may hold about a class of persons which is often never completely true for everyone in that population.

For example, to say that all colored people do very well at sports would be a stereotype.

Learn more about stereotypes in the link below:

link

i believe the answer is: b. mr. head had a long, tube-like face with a rounded open jaw and a short depressed nose.

this is because in the un-revised sentence it said that mr. heads face was long and tube-like, and he had a rounded open jaw. this is not a very grammatically correct because of how it seems to drag on with the and, replaced with, with, makes it sound more fluent in the description.