- How old is the Earth?
- When did the first organisms exist; how long ago?
- How are prokaryotes important to humans? What role do they play?
- What is the size of the smallest organism in the ocean? What is the name of that organism?
- What is the size of the largest organisms in the ocean? What is the name of that organism?
- What types of organisms account for 90% to 96% of the ocean’s primary productivity?
- What are the limiting factors for marine productivity?
- Where/when in the oceans is productivity high at the surface? Why?
- Where/when in the ocean is productivity low at the surface? Why?