The organs of excretion in flatworms are
b. contractile vacuoles.
c. Malpighian tubules
Animals that are hermaphroditic usually
a. fertilize their own eggs.
c. donate eggs to other individuals
d. all of these
A scolex is
a. the anterior attachment organ of a tapeworm.
b. the feeding organ of a fluke.
c. an appendage of a sandworm.
d. The egg of a sea star.
Which have a tough cuticle, a false coelom, and a complete digestive system and are facultative anaerobes?
A segmented body plan is common to each group EXCEPT
Schistosome worms enter the human body
a. in undercooked pork.
b. in drinking water.
c. by penetrating the skin.
d. via mosquito bites.
Elephantiasis is caused by a blockage of the flow of
a. intestinal contents.
Bivalves lack which of the following molluskan features?
A radula is which of the following?
b. feeding organ.
d. sensitive hair.
A mantle is found only among the
a. circulatory organs.
b. respiratory organs.
c. urinary organs.
d. endocrine organs.
Which of the following is NOT related to the other three?
a. free-living flatworms
Which of the following has a gut with two openings, a mouth and an anus?
The animal group that contains the greatest number of named species is
Which adaptation has contributed to the success of the insects?
a. specialized sensory organs
c. high reproductive capacity
d. all of the above
Which of the following is a disadvantage of an exoskeleton?
a. It must be shed for its owner to grow.
b. It does not provide as efficient a muscle anchorage as an endoskeleton.
c. It allows for excess water loss.
d. It is not flexible enough to wallow a full range of movement.
Spiders use which of the following mouthparts for subduing prey?
An unidentified arthropod has no antennae and eight pairs of legs. It is probably most closely related to
What is the crustacean appendage that is used for chewing food?
A wormlike arthropod with a flattened body and carnivorous eating habits would be identified as a
1. D. protonephridia
2. A. fertilize own eggs
3. A. anterior attachment organ of tapeworm
4. A. ...