What is the variable a scientist changes on purpose?
a. control group
b. constant varia...
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Which of the following is one of the four conditions necessary for natural selection to occur in a population? fewer organisms are born than the habitat can support mutation does not occur organisms have identical characteristics variation is inherited
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Which of the follow describes a disadvantage secondary sources have compared to primary sources?
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Abacteriophage typically attaches to the bacterium and then
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