Passive immunity can be obtained by
a. having the disease.
b. receiving a vaccination against the disease.
c. receiving antibodies
d. being exposed to a pathogen.
e. all of these.
Answer: c
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Bone tissue is hard because its matrix contains
1.collagen. 2.iron. 3.several minerals. 4.calcium salts. 5.elastic fibers.
what type of exotoxin causes gastroenteritis in patients infected with E.coli?
What will be an ideal response?
Parasites impact host populations by
a. draining nutrients from hosts. b. making hosts more vulnerable to predation. c. lowering birth rates and raising death rates. d. causing sterility e. all of these.
Which environment is most likely to produce trees without annual rings?
A. Tropical rain forest B. Northern evergreen forest C. Areas with alternating wet and dry seasons D. Temperate-deciduous forests E. None of these, because annual rings are characteristic of all trees