When did the major evolutionary expansion of terrestrial plants and animals occur?
A. Mesozoic era
B. Paleozoic era
C. 2 million years ago
D. Cenozoic era
Answer: A
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Removal of Giardia intestinalis from municipal water supplies involves the use of ________.
A. rapid sand filters B. gamma radiation C. predatory microorganisms D. slow sand filters
One of two genetically identical chromosomal units that are the result of DNA replication and are attached to each other at the centromere.
What will be an ideal response?
Which of the following contains all of the others?
A) biosphere B) community C) ecosystem D) population
The hypothesis that life began with the evolution of inorganic compounds into simple organic molecules, macromolecules, and protocells is called what?
A. chemical evolution B. organic chemistry C. speciation D. Darwinian evolution E. cell theory