The first system in the body to become visibly differentiated during development is the
A. reproductive system.
B. cardiovascular system.
C. digestive system.
D. respiratory system.
E. nervous system.
Answer: E
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Which of the following combinations represent prezygotic mechanisms of isolation?
a. hybrid breakdown and temporal isolation b. hybrid breakdown and gametic isolation c. hybrid sterility and temporal isolation d. mechanical and temporal isolation e. mechanical and hybrid breakdown
If a country engaged in free trade has an unlimited quantity of imports of a good available at a fixed price, the supply curve for that good is
a. upward sloping. b. perfectly inelastic. c. downward sloping. d. perfectly elastic.
Which of the following is NOT part of a homeostatic system?
a. positive feedback
b. sensory receptors c. integrating center d. effectors e. set points
Which of the following features enable organisms like planarian to respire and exchange nutrients?
A. a trilobed gastrovascular cavity B. coelomic fluid C. an open circulatory system D. closed circulatory system