What is Life - What is Life Introduction In this chapter we...

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What is Life? Introduction In this chapter we will learn how living organisms change as they become better adapted to their environment. Over billions of years, these changes have produced a large number of different kinds of organisms. It has been estimated that there may be 15 to 30 million different species living on earth. Living organisms are comprised of the same chemical elements that make up nonliving things and both obey the same laws of physics and chemistry. We can better understand what distinguishes living from nonliving by examining characteristics that all living organisms have in common. Some of these characteristics are discussed below. The student is encouraged to add to or modify these criteria so that they can develop a better understanding of life. Characteristics Common to All Living Organisms Living things are composed of cells Small organisms such as bacteria and many protists are composed of a single cell. Larger organisms are composed of many cells; they are multicellular
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This note was uploaded on 11/10/2011 for the course BIOLOGY bi 101 taught by Professor - during the Fall '10 term at Montgomery.

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What is Life - What is Life Introduction In this chapter we...

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