18.1 Point out the major groups of nemathelminthes. Identify the main characteristics of nemathelminthes. Discuss the life cycles of some parasitic forms of nemathelminthes. Discuss the pathology of some parasitic forms of nemathelminthes. 18.5 Discuss biological success.
Contrast protostomates and deuterostomates.
Examine the mollusks. 20.1 Point out the major groups of mollusks. 20.2 Identify the major characteristics of the mollusks. Compare the life styles of various mollusks. 20.4 Point out the economic importance of the mollusks.