Task#9

THE BEGINNING

1. How old is the Earth?
2. When did the first organisms exist; how long ago? 
3. How are prokaryotes important to humans? What role do they play?

KINGDOMS

1. What is the size of the smallest organism in the ocean? What is the name of that organism? 
2. What is the size of the largest organisms in the ocean? What is the name of that organism? 

PRODUCTIVITY

1. What types of organisms account for 90% to 96% of the ocean’s primary productivity?
2. What are the limiting factors for marine productivity? 
3. Where/when in the oceans is productivity high at the surface? Why? 
4. Where/when in the ocean is productivity low at the surface? Why? 

*** CITE YOUR SOURCES!