Homo erectus has been shown to have dispersed from
A. South America.
B. Asia.
C. North America.
D. Africa.
E. Europe.
Answer: D
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A mother ship arrives from Planet Lichen to take all lichens on Earth back to their home planet. Which of the following would be consequences of the removal of lichens from Earth? Check all that apply.
_____ Levels of chemical pollutants in the air can no longer be monitored using lichens. _____ Levels of radiation in the soil can no longer be monitored using lichens. _____ Soil formation by breaking down parent rock will increase as lichens can no longer impede the process. _____ Nitrogen fixation will decrease.
Metabolic pathways are considered what type of system?
a. closed b. open c. open and closed d. neither open nor closed
Reptiles are not able to eat as frequently as mammals and birds can eat. This is due to a trait that mammals and birds share but that reptiles do not have. What is this trait?
A) airfoils B) endothermy C) amniotic egg D) teeth
How do all viruses differ from bacteria?
A) Viruses are filterable. B) Viruses are obligate intracellular parasites. C) Viruses do not have any nucleic acid. D) Viruses are not composed of cells. E) Viruses do not reproduce.