1. In arthropods, molting is necessary because o the chitinous exoskeleton cannot grow

a. worn exoskeletons make arthropods more susceptible to predators

b. arthropod appendages generally increase in number as the animal ages

c. the exoskeleton is progressively reabsorbed by body tissue

d. the environment degrades the exoskeleton, which therefore must be shed and replaced

2. The dispersive stage of the cnidarian life cycle is the stage.

a. medusa

b. tadpole instar

c. polyp

d. radula