The typical sign of primary syphilis is
A) a chancre at the site of infection.
B) a widespread rash.
C) lymphadenopathy.
D) gummas in various organs.
E) paralysis.
A
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In early ancestors of the modern giraffe, longer necks allowed animals to reach higher tree branches as food. This would lead to ____ in the ancestral giraffe population.
A. disruptive selection B. directional selection C. sexual selection D. genetic drift E. stabilizing selection
What distinguishing feature characterizes aerobic and anaerobic respiration but does not play a role in fermentation pathways?
A. The absence of O2 B. Oxidation-reduction reactions C. Hydrolysis reactions D. The presence of an electron transport chain
Ocean pollution includes all except
a. toxins. b. heavy metals. c. dissolved oxygen. d. oil. e. PCBs.
The female plant structure on which a pollen grain will land is the:a
style. b. pistil. c. stigma. d. anther. e. style.