Which group of animals has one-way flow of air through its lungs, whereas all the others have tidal flow?
A. mammals
B. amphibians
C. birds
D. reptiles
C. birds
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Which statement is true concerning human genetic
disorders? a. There are more than 15,000 of them. b. Many are rare. c. They contribute to many age-related disorders. d. They cause 20 to 30 percent of all infant deaths per year. e. All of these are true.
Darwin realized that most species produce many more offspring than is necessary to maintain a constant population. The "excess" individuals in a population
A) mutate and are able to adapt to new environments. B) die before they can reproduce. C) evolve to become new species. D) migrate to another location.
The term Protista was used earlier to separate out the archaea from the true bacteria.
a. true b. false
Which organisms acquire carbon for organic molecules from other organisms and use chemical compounds as a source of energy?
A. Photoautotrophs B. Chemoautotrophs C. Chemoheterotrophs D. Photoheterotrophs