Response to specific pathogens that can improve with subsequent exposure is
A) the first line of defense.
B) the second line of defense.
C) the third line of defense.
D) microbial antagonism.
E) innate immunity.
C
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Which of the following lung volumes change during exercise?
a. residual volume b. tidal volume c. vital capacity d. lung capacity e. lung volume
Closely related plant species that attract different pollinators resulting in reproductive isolation is an example of
A. sympatric speciation. B. allopatric speciation. C. hybrid inviability. D. hybrid infertility. E. hybrid breakdown.
After an oil spill, bacteria that can metabolize hydrocarbons are released for bioremediation. After a month, two areas affected by the spill show different levels of improvement. Which factor should be measured to determine the difference in effectiveness between the two sites?
A. Nutrient levels B. pH C. Salinity D. Oxygen levels E. Temperature F. All of these factors may play a role.
Relative dating uses ___________ to estimate how old a fossil is.
A. Embryonic structures B. Radioactive structures C. A molecular clock D. Structural features E. Depth within rock layers