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Part of Hall of Ocean Life.
What are the implications of life in water? Brainstorm with your students a list of things that are possible in water that are not possible on land, and vice versa. Record the students' responses on the board. Possible answers include types of locomotion (e.g., swimming or walking), feeding methods (e.g., filtration and chewing) and different kinds of communication (e.g., sonar or talking).
Discuss with students that on land, living things are either supported internally by cell walls or possess an endo- or exoskeleton. In water, organisms that lack "organic support" such as a skeleton rely on the properties of buoyancy for external support. This activity will help students visualize how the properties of buoyancy affect the structure of an organism.
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