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.
Head size. Your infant's head will grow about Â½ inch every month for the first 6 months. His head will grow Â¼ inch per month between 6 months and 1 year of age. His head should measure close to 17 inches around by the time he is 6 months old and 20 inches by 1 year of age.