What is credited with gains in industrial productivity.

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

He did chinese culture change during the warring states period

Balanced rock sits on a thin spike of rock in a canyon what forces keep the rock balanced on its tiny pedestal