The primary metal sulfides emitted from the black smokers are ________ sulfides
A) copper
B) iron
C) magnesium
D) zinc
Answer: B
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Density-dependent mortality describes a situation in which:
A. seedlings of common species are less likely to be eaten. B. seedlings of rare species are more likely to be eaten. C. seedlings of rare species are more likely to be infected by pathogens. D. seedlings of common species are more likely to be infected by pathogens. E. seedlings have an equal chance of being infected or eaten regardless of density.
A __________ is a chemical messenger that binds to receptors on a cell and brings about
metabolic, physiological, or behavioral responses in the organism.
a. hormone b. enzyme c. nucleus d. growth factor
When impulses are conducted through the heart, transmission is delayed at the __________ so that the
__________ may contract before the __________. a. sinoatrial node; atria; ventricles b. sinoatrial node; ventricles; atria c. atrioventricular bundle; atria; ventricles d. atrioventricular node; ventricles; atria e. atrioventricular node; atria; ventricles
Which of these is not a characteristic of Klinefelter syndrome?
A) underdeveloped testes B) long limbs C) low testosterone levels D) XXY genotype E) web of skin between the neck and shoulders