Which of the following traits is seen only in closed circulatory systems?
a. blood moves through heart(s)
b. blood remains inside a heart or vessel at all times
c. blood moves through large vessels
d. blood mixes with interstitial fluid
b
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The secretion of pepsinogen and HCl is controlled by the hormone
A. insulin. B. gastrin. C. pepsin. D. secretin. E. cholecystokinin.
A homozygous recessive where "A" represents the trait has two recessive alleles symbolized by
__________. Fill in the blank(s) with the appropriate word(s).
The ABO blood types have __________ different
genotypes. a. 4 b. 6 c. 8 d. 12 e. 16
Cells carry out three major types of work. Which of the following involves energy for cell motility and the movement of structures within cells?
A. Chemical work B. Mechanical work C. Transport work D. None of the choices are correct.