Characteristics Common to All Living Organisms

Characteristics Common to All Living Organisms -...

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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 . Living things are organized atoms molecules macromolecules organelles cells tissues organs organ systems individual organism population community ecosystem The first three items on this list ( atoms , molecules , and macromolecules ) will be discussed further in the chapter on chemistry . Cells are considered to be the smallest structure that is alive. They are often too small to see without the aid of a microscope. All living organisms are composed of cells. The smallest organisms are composed of a single cell; larger organisms are composed of more than one cell. Similar kinds of cells may be arranged together to form a tissue . Tissues have specific properties and functions. For example muscle tissue is composed of muscle cells. It functions to move body components. Two or more tissues that form a structure with a specific function is an organ . For example, the heart is an organ formed from muscle tissue, nervous tissue, connective tissue, and epithelial tissue. It functions to pump blood. An organ system consists of two or more organs which perform a specific task. Some organ systems are: the integumentary, nervous, sensory, endocrine, skeletal, muscular, circulatory, immune, lymphatic, digestive, respiratory, excretory, and reproductive systems. A population is an interbreeding group of organisms (the same species) that occupies a particular area. Two or more populations form a community . The word community refers to the organisms. The word
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Characteristics Common to All Living Organisms -...

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