Which of the following findings was essential for Edward Jenner's vaccination process?
A) Exposure to a milder disease form may produce immunity.
B) A weakened microorganism will not cause disease.
C) Someone who recovers from a disease will not acquire that disease again.
D) Disease is caused by viruses.
E) Pathogenic microorganisms infect all humans and animals in the same manner.
A
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By examining fossil evidence, paleontologists believe that mammals evolved from ancestors of modern
A) arthropods. B) amphibians. C) sharks. D) lobefins. E) reptiles.
Species that live in the same geographical area are called sympatric.
Answer the following statement true (T) or false (F)
Sugars with three to seven carbon atoms are called
A. disaccharides. B. monosaccharides. C. steroids. D. polysaccharides. E. trisaccharides.
In the chemical equation for burning methane (CH4 + O2 ? CO2 + H2O), CH4 and O2 are the _____ and CO2 and H2O are the _____.
A) molecules; atoms B) reactants; products C) products; reactants D) anions; cations