The medicinal leech, once used to withdraw "unhealthy" blood from patients, produces ________ to ensure blood flow from the host?
A. anticoagulants
B. antibodies
C. blood clots
D. antibiotics
E. suture material
Answer: A
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Poliovirus receptors are found
A. in spinal cord anterior horn cells only. B. in cells of all tissues. C. in gut cells only. D. in nasopharynx, gut, and spinal cord anterior horn cells.
In the carbon cycle, one of the ways in which carbon is returned to the atmosphere is by respiration
____________________ Indicate whether the statement is true or false.
?The first known hominin species to leave Africa was _______
a. Homo sapiens
b. Homo erectus
c. Homo habilis
d. Australopithecus afarensis
e. Homo neanderthalensis
The phase of the bacterial growth curve during which microbial growth slows and the rate of multiplication equals the rate of cell death is the
A. log phase. B. telophase. C. lag phase. D. stationary phase. E. death phase.