Cytokines perform which of the following functions?
A) bringing leukocytes to injured tissue
B) helping leukocytes migrate out of the blood vessels
C) activate leukocytes
D) all of the above
D
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Water's salinity can be increased by
A) entering freshwater streams. B) decreased rates of evaporation. C) ice freezing. D) ice melting.
Federal Housing Administration loans favored new single-family housing over the rehabilitation of older houses or apartment buildings
Indicate whether the statement is true or false.
The Environmental Protection Agency was created in the mid-1980s
Indicate whether the statement is true or false
In science, a theory is
A. an explanation supported by a substantial body of evidence. B. a tentative explanation, comparable to a hypothesis. C. speculative and unsupported by facts. D. something that can never be proven wrong.