Insects and crustaceans studied in the lab this week share what two characteristics? 1. exoskeleton of chitin and are in the clade ecdysoza. 2. exoskeleton of chitin and are in the clade lophotrochozoa 3. exoskeleton of chitin and both have three pairs of biramous appendages 4. exoskeleton of chitin and both are found in terrestrial habitat