Based on the assumption that most students have a natural curiosity about the plant and animal life residing in the oceans, this document provides students in grades five through eight with activities in marine biology. The book provides illustrated information and learning activities dealing with: (1) diatoms; (2) the life cycle of the jellyfish; (3) soft-bodied animals; (4) mollusks (including a dichotomous key); (5) octopi and squid; (6) clams; (7) making seashell collections; (8) oysters; (9) echinodermata; (10) starfish; (11) how fish get oxygen; (12) making a small ecosystem; (13) the respiration rate of goldfish; (14) spelling names of fish; (15) a depth chart of ocean dwellers; (16) external and internal features of sharks; (17) a dichotomous key for identifying sharks; (18) making a plankton net; (19) codfish; (20) whales; (21) records of the sea; and (22) examples of classic books about the sea. A reproducible marine biology certificate is included, along with an answer key to all of the questions asked in the book. (TW)