The difference between geographic isolation and habitat differentiation (isolation) is the _____
A) relative locations of two populations as speciation occurs
B) speed (tempo) at which two populations undergo speciation
C) amount of genetic variation that occurs among two gene pools as speciation occurs
D) identity of the phylogenetic kingdom or domain in which these phenomena occur
A
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The eggs of the blood fluke Schistosoma haematobium range from 110 to 170 µm long by 40 to 70 µm wide and have a sharp, pointed terminal spine. In which specimen is this organism most likely found?
a. Ascites fluid b. Sputum c. Bile d. Urine
A fever augments the host's defenses by
A. enhancing microbiostasis. B. enhancing the activity of the immune system. C. stimulating leukocytes into action. D. All of the choices are correct.
The organic matter in soil is referred to as
A. mineral soil. B. inorganic substance. C. bedrock. D. humus.
Birds are most closely related to
A. crocodiles. B. snakes. C. mammals. D. non-avian dinosaurs. E. amphibians.