All of the following may have been in the atmosphere of primitive Earth EXCEPT
A. hydrogen.
B. ammonia.
C. water.
D. oxygen.
D. oxygen.
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One of the biggest issues of technology vs. natural selection is the rise of “super bugs”. What is it about our quickly changing world is contributing to this issue?
A) Habitat destruction is bringing more people into contact with pathogens previously isolated from human hosts. B) Jet travel can send an infectious agent around the world in a day or two. C) Climate change might prevent cold temperatures from killing the animal that carried the zoonotic disease (ex: winter killed the fleas that carried the microbe that caused the bubonic plague). D) A&B E) B&C F) All of the above
Oyster reefs are usually oriented at right angles to the currents in estuaries. How do you think this could be an advantage to the oysters living in this community?
What will be an ideal response?
The archea include which of the following?
a. extreme thermophiles b. alga c. protista d. animals e. all of these
The fossilized remains of two different species are found and scientists are interested in determining the evolutionary relationship of the two species. Which of the following could be used to determine the relatedness?
A. vestigial structures B. biogeography C. homologous structures D. All of the choices could be examined to determine relatedness.