The structure used to amplify an elephant seal bull's roar is a(n):
a. inflated proboscis.
b. hallow tusk used as a horn.
c. sirenaphores.
d. blowhole.
e. melon.
A
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Match each insect order with the correct representative insects.
1. Diptera 2. Hymenoptera 3. Coleoptera 4. Hemiptera a. beetles b. flies c. true bugs d. ants, bees, wasps
Bacteria in the intestinal tract prevent
pathogens from causing disease by a. crowding them out. b. eating other bacteria. c. producing protein traps to kill them. d. submerging them in acid in the stomach. e. doing all of these.
Internal fungal infections are very common in healthy individuals.
a. true b. false
Which part of the immune system's "learning system" is responsible for maintaining life-long immunity against measles after a measles infection?
a. somatic recombination c. affinity maturation b. clonal expansion d. retention of responding cells