Which one of the following species is endangered by human activity but not yet extinct?
A. the dodo
B. the dusky seaside sparrow
C. the African white rhinoceros
D. the carrier pigeon
E. the Bali tiger
Answer: C
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When the dentist gives you a shot of anesthetic before drilling into one of your teeth, she is numbing a facial nerve, which is a:
A. cranial nerve; part of the peripheral nervous system. B. cranial nerve; part of the central nervous system. C. spinal nerve; part of the peripheral nervous system. D. spinal nerve; part of the central nervous system. E. None of the above are correct.
An inversion heterozygote contains
A. two homologous chromosomes with inversions. B. two normal chromosomes. C. one normal chromosome and one chromosome with an inversion D. None of the answers are correct
What describes the greater fitness of individuals who carry one copy of the sickle-cell allele in areas where malaria is common?
A) low genetic variability B) heterozygote advantage C) the benefit of mutualism D) competitive exclusion
Continental drift is caused by
A) tidal forces. B) ocean currents. C) plate tectonics. D) long-term weathering. E) earthquakes.