| Introduction
One of the commonly mentioned differences between plants and animals is the ability to move. While this is not totally correct, since flagellated plant gametes can move and many attached, filter feeding invertebrates are sessile; movement or locomotion is generally considered an animal characteristic. In this laboratory session you are asked to consider modes of locomotion and the utilization of something called the hydrostatic skeleton. Before you begin this lab, review the different types of body cavities with your instructor. We will begin with a relatively simple animal, the sea anemone, and progress to more complex invertebrates like snails and earthworms.
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