Class and Period: _____________________________
Directions: Answers must be in essay form. Outline form is NOT acceptable. Labeled diagrams may be used to supplement discussion, but in no case will a diagram alone suffice. It is important that you read each question completely before you begin to write.
1 Discuss the significance of each of the events listed below in the evolution of living things.
a. Primordial reducing atmosphere
b. Origin of photosynthesis
c. Increase in atmospheric oxygen and the development of the ozone layer
d. Origin of eukaryotes