True/False
Indicate whether the statement is true or false.
____ 1. The acute senses of arthropods are the result of organs such as compound eyes and antennae.
____ 2. Arthropods have a well-developed excretory system consisting of nephridia.
____ 3. The well-developed arthropod nervous system consists of a double ventral nerve cord, an anterior brain, and several ganglia.
____ 4. Efficient gas exchange in arthropods is accomplished by tracheal tubes, book lungs, or gills.
____ 5. The exoskeleton is a protective adaptation that enables arthropods to move freely.
____ 6. Jointed appendages are advantageous because they are limited in their strength and functions.
____ 7. In arthropods, appendages are adapted for a variety of purposes including sensing, walking, feeding, and mating.
____ 8. The exoskeleton of arthropods is harder and provides more protection than the cuticle of annelids.
Modified True/False
Indicate whether the statement is true or false. If false, change the identified word or phrase to make the statement true.
____ 9. Roundworms are have one body opening. _________________________
____ 10. All roundworms are parasites. _________________________
____ 11. Trichinella can be ingested in raw or undercooked pork. _________________________
____ 12. Pinworms are the most common parasites in children living in the United States. _________________________
____ 13. Hookworms can be contracted by eating improperly cooked infected pork. _________________________
____ 14. The most complex and most recently evolved mollusks are gastropods. _________________________
____ 15. Earthworms are hermaphrodites because each worm produces both eggs and sperm. _________________________
____ 16. The respiratory organs in aquatic gastropods are primitive lungs. _________________________
____ 17. Gastropods have two shells. _________________________
____ 18. The excretory structures in