Example of selective breeding: Cows that produce lots of milk. Selective breeding to create more useful varieties of animals and plants is a form of biotechnology that human beings have used for thousands of years. Biotechnology includes any use of science or technology to alter the characteristics of a particular breed or animal.
B, the independent variable because this is the one that is purposefully changed in an experiment to test the hypothesis.
Explanation:
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The number of electrons in the outermost shell of an atom determines its reactivity.
