Individuals that are heavy smokers may eventually have trouble clearing the mucous from their lungs because the structures that move fluid along the epithelial lining of the lung become damaged over time. What are these structures called?  

A.  Pili
B.  Flagella
C.  Cell walls
D.  Cilia


D.  Cilia

Biology & Microbiology

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The common ancestor of the protostomes had a coelom. What does this suggest?

A) All lophotrochozoans have a coelom. B) There are no pseudocoelomates within the protostomes. C) There are no acoelomates within the protostomes. D) The body cavity evolved before the lophophore.

Biology & Microbiology

Which muscles contract during a restful expiration?

a. external intercostals. b. diaphragm. c. abdominal. d. both b and c.

Biology & Microbiology

Plants are:

a. multicellular, prokaryotes, autotrophs b. unicellular, eukaryotes, autotrophs c. multicellular, eukaryotes, autotrophs d. multicellular, eukaryotes, heterotrophs

Biology & Microbiology

An advantage of a complete digestive system over a gastrovascular cavity is that the complete system _____

A) excludes the need for extracellular digestion B) allows for specialized regions with specialized functions C) allows extensive branching D) facilitates intracellular digestion

Biology & Microbiology