If two different species of fish fossils were found in two different layers of sedimentary rock, what might one infer about the specimens?
A. The species in lower layer died first
B. They died at the same time
C. The species in the higher layer evolved from the species in the lower layer
D. The species in the higher layer died first
E. The two species are unrelated
A
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If blood donor type “Z” is Rh+ and first-time blood
recipient “Z” is Rh-, __________ and __________ will result. a. no agglutination; Rh antibody formation b. no agglutination; no Rh antibody formation c. agglutination; Rh antibody formation d. agglutination; no Rh antibody formation e. none of these
Using the data in Figure 53-3, the cause of the decline of the wolf population in 1982 was:a
a sharp decrease in food supply. b. a decrease in the intrinsic rate of increase for the wolf population. c. competition with a newly introduced predator. d. introduction of a disease organism. e. cannot be determined from the data provided.
What substance causes yeast bread to rise?
A. alcohol B. lactic acid C. sugar D. carbon dioxide E. oxygen
The surface of each B lymphocyte is covered with about 250,000 to 500,000 identical copies of (BCR/MHC/TCR)
What will be an ideal response?