11) What kind of locomotion do jellyfish use to move through the water?
12) What is the study of marine organisms called?
13) What is the name of the ocean that covers the majority of the Earth's surface?
14) What type of animals are most studied in marine biology?
15) In what year was the first plastic ocean gyre discovered?
16) Which of these is NOT a type of plankton?
17) How much of the Earth's oxygen is produced by the oceans?
18) What is the average depth of the ocean?
19) The Sargasso Sea is located in which ocean?
20) What percentage of marine species have been discovered and studied?