Allopatric speciation requires ____.
A. accelerated gene flow
B. physical separation
C. physical diversity
D. behavioral diversity
E. sexual selection
Answer: B
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B cells are more effective than macrophages in presenting antigens to activate T cells when
A. antigen concentrations are low. B. macrophages are in short supply. C. antigen concentrations are high. D. None of the choices are correct.
The Heterophyes heterophyes worm, which has a genital sucker that surrounds the genital pore, has a variety of reservoir hosts including dogs, cats, and birds and a second intermediate host of freshwater:
a. snails. b. fish. c. crabs. d. shrimp.
The hepatic-portal system describes the arrangement of blood vessels between the liver and the ____
a. stomach b. pancreas c. large intestines d. small intestines e. heart
Obesity corresponds to a BMI over ____
a. 20 b. 22 c. 25 d. 28 e. 30