Which species is considered to be the most ancient?
a. Homo erectus
b. Australopithecus afarensis
c. Australopithecus sediba
d. Homo sapiens
e. Sahelanthropus tchadensis
ANSWER: e
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Which is correct for the description "alkaline slant, acid butt, no H2S"?
a. Salmonella spp. b. E. coli c. Proteus spp. d. Pseudomonas spp.
Which structure prevents blood flowing back into the heart from the aorta between heartbeats?
A. semilunar valve B. atrioventricular valve C. tricuspid valve D. mitral valve E. ductus arteriosus
Which animal has radial symmetry, a gastrovascular cavity, and the same opening for the entry of food and expulsion of waste?
a. a cnidarian b. a flatworm c. an annelid d. a mollusk e. a sponge
Four of the following can cause birth defects. Which one is the exception?
a. tobacco b. alcohol c. poor nutrition d. rubella e. folic acid