A brachiopod can be distinguished from a bivalve by the presence of
A) two hinged shells.
B) a digestive system with separate mouth and anus.
C) a lophophore.
D) suspension feeding.
E) a distinct head.
Answer: C
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Biology
- A student observes a wormlike organism crawling about on dead organic matter. Later, the organism sheds its outer covering. One possibility is that the organism is a larval insect (like a maggot). However, it might be a member of the phylum ________, and one way to distinguish between the two possibilities is by looking for ________.
- Nematode worms and annelid worms share which of the following features?
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- A terrestrial mollusc without a shell belongs to which clade?
- Which mollusc clade includes members that undergo embryonic torsion?
- If a lung were to be found in a mollusc, where would it be located?
- While sampling marine plankton in a lab, a student encounters large numbers of fertilized eggs. The student rears some of the eggs in the laboratory for further study and finds that the blastopore becomes the mouth. The embryo develops into a trochophore larva and eventually has a true coelom. These eggs probably belonged to a(n)
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- Which clade in the phylum Cnidaria includes "jellies" with rounded (as opposed to boxlike) medusae?
- The members of which clade in the phylum Cnidaria occur only as polyps?
- Which of the following is true of members of the phylum Cnidaria?
- How many of the following are characteristics of at least some members of the phylum Cnidaria? 1. a gastrovascular cavity 2. a polyp stage 3. a medusa stage 4. cnidocytes 5. a pseudocoelom
- Sponges are most accurately described as
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