Which of the following animals exhibits the most flexible osmoregulatory and excretory systems?
a. A marine fish
b. A migratory salmon returning to its home stream from the ocean
c. A parasitic flatworm
d. A vampire bat
e. A migratory salmon returning to its home stream from the ocean and a vampire bat
Answer: e. A migratory salmon returning to its home stream from the ocean and a vampire bat
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Pathogen virulence NEVER changes throughout a host's life
Indicate whether the statement is true or false.
Sexual reproduction results in:
a. the preservation of the parental genotypes. b. low death rates among offspring. c. genetic similarity among offspring. d. genetic diversity among offspring. e. offspring with fitness equal to that of their parents.
Answer the following questions true (T) or false (F)
1. Lymph "glands" (nodes) swelling is a sign that an infection is present. 2. Antibodies are produced by plasma cells and regulatory T cells. 3. B cells are the main cells of the cell-mediated pathway.
The information collected during the experiment or observation is called
A. the hypothesis. B. the conclusion. C. a theory. D. the data. E. a hunch.