Carbohydrates are technically hydrates of carbon; structurally it is more accurate to view them as polyhydroxy aldehydes and ketones. The term is most common in biochemistry, where it is a synonym of saccharide, a group that includes sugars, starch, and cellulose.
A human head will typically range from 54 to 57 inches in circumference. The length is on average 21 to 22 inches and the width is 17 to 18 inches.nswer by dwammer (710). The average size of the human head is 22 inches long and about 18 inches wide. The average circumferance is 55 inches around the head. add a comment.
I have long hair and I can see parts of my neck from a mirror. and when I look in the mirror with the sun shining through I can see through open areas of my hair. On average, each person's head carries about as many as 150,000. By the age of 25, this number has fallen to about 600, but the number depends on the physical type of the individual. Between the ages of 30 and 50, the number drops further, to 250-300. There is only a slight further fall with age. Each new hair grows for several years, and can reach over a metre in length.