Question 26 - ESL Reading Skills Practice Test for the ACCUPLACER Test

Since the beginning of time, people have wanted something to move through their hair to make it look nice. In ancient times, they used their fingers to fix their hair. Then, the comb was invented, but it was made out of things in nature at first, like shells or wood. Finally, plastic was discovered and the comb was one of the first things made of the new substance.

In the first sentence, the word “it” refers to: