Identify and explain the characteristics of acoelomates and coelomates, including embryonic development, symmetry, and advantages of specific body plans.

You're on a roll — here are the answers for Activity 3: 3.1 a) An acoelomate: A b) A coelomate: B 3.2 Two phyla represented by body plan B (coelomate) are: • Annelida • Arthropoda 3.3 The tissue-filled layer (mesoderm) develops from the mesoderm embryonic layer. 3.4 The type of symmetry characteristic of organism B is bilateral symmetry. 3.5 Two advantages of an exoskeleton in arthropods: • Protection: It provides a rigid outer covering that protects the soft internal tissues from physical injury and predators. • Support and Muscle Attachment: It provides structural support for the body and a firm surface for muscles to attach, enabling movement. What's next?