During a secondary immune response
a) antibodies are made quickly and in great amounts
b) antibody production lasts longer tan in a primary response
c) B cells become plasma cells
d) all of the choices are correct
Answer: d) all of the choices are correct
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_____ is the process in which two groups of organisms speciate in response to each other and at the same time
A. allopatric speciation B. peripatric speciation C. adaptive radiation D. co-speciation E. sympatric speciation
Surface barriers, such as cutaneous and mucous membranes, serve the immune system as the __________.
What will be an ideal response?
Taste buds contain taste cells that convert chemical signals into action potentials.
a. true b. false
Island species are particularly vulnerable to extinction for all of the following reasons except
A. fewer endemic species are found on islands. B. humans have introduced competitors. C. island species have lost the ability to escape predators. D. humans have introduced diseases. E. humans have altered habitats.