Which brain structure is the largest and most complex?
A. The hypothalamus
B. The thalamus
C. The cerebrum
D. The cerebellum
Answer: D
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Researchers hypothesize that the hybrid zone of Bullock’s orioles and Baltimore orioles remains narrow because
hybrids ____.
a. are routinely eliminated by natural selection within the hybrid zone b. prefer the moist habitats of the Baltimore oriole c. prefer hotter and drier habitats of the Bullock’s oriole d. are well adapted to both the dry habitats of the Bullock’s oriole and to the moist habitats of the Baltimore oriole e. are not well adapted to the dry habitats of the Bullock’s oriole or to the moist habitats of the Baltimore oriole
It has been observed that organisms on islands are different from, but closely related to, similar forms found on the nearest continent. This is taken as evidence that ____
A) island forms are descended from mainland forms B) common environments are inhabited by the same organisms C) island forms and mainland forms have identical gene pools D) the island forms and mainland forms are converging
When applied to underripe fruit, the hormone ________ hastens ripening.
A. gibberellin B. ethylene C. abscisic acid D. auxin
What subphylum do tunicates and seq squirts belong to?
A. Animalia B. Cephalochordata C. Chordata D. Urochordata E. Vertebrata