True or False: If an individual is infected with a pathogen, the antibody titer to that pathogen will decrease
a. TRUE
b. FALSE
Answer: B
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Select the most complete explanation of what the pH scale measures.
A. The acidity of a solvent B. The alkalinity of a solvent C. The concentration of buffers in a solution D. The concentration of hydrogen ions in a solution
The mechanism of sympatric speciation has been verified in hemp nettles by:
a. creating unique hybrids under laboratory conditions. b. producing hybrids that were 98% fertile under laboratory conditions. c. producing experimental hybrids that formed fertile offspring with the naturally occurring hybrid. d. producing experimental hybrids that could reproduce successfully with both parent species. e. creating hybrids that reproduced through the F4 generation before dying from hybrid inviability
Competition among individuals of different species is called
A. intraspecific competition. B. resource competition. C. interspecific competition. D. commensalism. E. basal competition.
Which of the following is a protective structure where egg cells are formed in bryophytes and some other plants?
a. stoma b. strobilus c. sporangium d. archegonium