Which cells engulf foreign particles that reach the lungs?
A) type II alveolar cells
B) alveolar macrophages
C) goblet cells
D) ciliated cells
E) type I alveolar cells
Ans: B) alveolar macrophages
Biology & Microbiology
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When a gas changes from a gas into a liquid, it is called
a. condensation. b. evaporation. c. melting. d. sublimation
Biology & Microbiology
What key assumption of the endosymbiotic theory is observed in living animals?
What will be an ideal response?
Biology & Microbiology
Label the leaf arrangements as opposite, whorled, or alternate. 
A. ________B. ________C. ________
What will be an ideal response?
Biology & Microbiology
All organic molecules contain
A. carbon and nitrogen. B. hydrogen and oxygen. C. nitrogen and oxygen. D. hydrogen and carbon. E. oxygen and carbon.
Biology & Microbiology