Among domesticated birds and mammals it is common that when strangers are placed together there will be intense fighting. After a short period of time the fighting stops because they
A. are tired.
B. have learned to avoid aggressive behavior.
C. have established a dominance hierarchy.
D. have established a territory.
C. have established a dominance hierarchy.
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Effector cells
a. are fully differentiated lymphocytes. b. manufacture and secrete antibodies. c. can develop from either T or B cells. d. secrete antibodies or interleukins depending on their origin. e. include all of these descriptions.
Most communities have many common species and a few rare species
Indicate whether the statement is true or false
Based on what you know about various species richness hypotheses, a large, tropical continent would likely have ________ species richness.
A. intermediate B. high C. variable D. uneven E. low
Loss of the cell wall is required for the endosymbiotic theory.
a. true b. false