If point (a , b) is on the unit circle associated with the rotation t, then the point on the unit circle associated with rotation t + π / 2, has the following coordinates.

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