The toll on a bridge is $1. 00 for cars and $2. 50 for trucks. In one hour, a tollbooth operator collects a total of $105 in tolls.

How are 3-d printers useful in studying evolution? a. to color the fossils of organisms b. to create clones of extinct organisms c. to create replicas of fossils d. to prepare paper cutouts of organisms e. to study the composition of fossils