1. What is the largest biome on planet Earth?

2. What do we call the regions of the marine biome where rivers and streams flow into the oceans?

3. In which zone or layer of the ocean do plankton live?

4. Which zone or layer of the ocean is the middle zone and resides between 600 feet deep to around 3,000 feet deep?

5. Which zone or layer of the ocean is completely dark and the deepest part of the ocean?

6. Through what process do plankton get energy and provide energy to the rest of the ocean?

7. Which zone or layer of the ocean is the largest of the ocean zones?

8. Which zone or layer of the ocean is home to most of the ocean's animal and plant life?

9. Which of the following is considered a marine mammal?

10. What living organism in the ocean helps to provide much of the Earth's oxygen?