An interaction that benefits both species is ____
a. a neutral relationship
b. commensalism
c. competition
d. mutualism
e. parasitism
ANSWER: d
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Charles Darwin
a. studied to be a physician. b. studied to become a clergyman. c. pursued his interests in natural history. d. did all of these. e. did none of these.
Antigens are
A. chemicals that enhance all lymphatic organs. B. foreign molecules to which white blood cells can bind through specialized receptors, leading to the proliferation of lymphocytes. C. proteins produced by plasma cells that stimulate the clotting of blood. D. proteins produced by virus-infected cells that stimulate an immune response.
The number of ill individuals within a population is referred to as
A) morbidity. B) mortality. C) residency. D) prevalence.
Reproductive isolation often occurs due to
a. geographic separation. b. species incompatibility. c. mutation. d. genetic drift. e. natural selection.