Which of the following structures is the location of gas exchange between the inhaled air and the blood?
A) trachea
B) bronchioles
C) alveoli
D) bronchi
E) pleura
C
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Which statement is true of polytomy branches?
a. Organisms in each branch share a common ancestor. b. Polytomy represent mass speciation from a single mutation event. c. The longest branch is the ancestor of the other sister taxa. d. Polytomy branching only occurs in single-celled organisms.
Four of the five structures listed below are sinks for
pressure-flow translocation. Select the exception. a. fruits b. roots c. mature leaves d. seeds e. rapidly growing tissue
The cell-mediated immune response is a function of ____
a. B cells b. T cells c. plasma cells d. blood cells e. antigen producing cells
Pseudogenes tend to have lower average substitution rates than functional genes
Indicate whether the statement is true or false