Exam 19: Precambrian Earth and Life History

Which of the following might be considered advantages that multi-celled organisms have over single celled organisms?

Multi-celled organisms are those composed of many cells,all of which function independently.

What is the basic difference between the Archean and the Proterozoic?

Stromatolites are the product of organic activity.

What are heterotrophic organisms?

What are the two main rock types that characterize Archean shield areas?

Between 1.3 and 1.0 billion years ago,the __________ orogeny occurred in the supercontinent __________.

Sandstone-carbonate-shale assemblages are characteristic of sedimentation at what type of plate margin? Describe when they form in the Wilson cycle,and what types of environments they represent?

Sandstone-carbonate-shale assemblages were deposited along _______ continental margins.

The boundaries of subunits or smaller cratons within the shield are based on topographic expression of different rock types.

Why is it believed that cyanobacteria must have been preceded by even simpler organisms?

Pegmatites are associated with ____ rocks and contain ____,____,and ____.

Continental growth during the Early Proterozoic development of Laurentia was related to ____________________ of ____________________ age cratons.

The oldest eukaryotes in the fossil record are at least how old?