Figure \(\PageIndex1\): Multicellular Organisms: A toad represents a highly organized framework consisting of cells, tissues, organs, and organ systems.

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Organisms are highly organized, coordinated structures that consist of one or more cells. Even really simple, single-celled organisms are remarkably complex: within each cell, atoms comprise molecules; this in turn comprise cell organelles and also other moving inclusions. In multicell organisms, comparable cells form tissues. Tissues, in turn, collaborate to create organs (body structures with a distinctive function). Organs work-related together to type organ systems.

Figure \(\PageIndex1\): Response to Stimuli: The leaves of this sensitive plant (Mimosa pudica) will instantly droop and also fold when touched. After ~ a few minutes, the plant returns to normal.


Single-celled organisms reproduce by very first duplicating your DNA. Lock then division it equally together the cabinet prepares to division to kind two new cells. Multicell organisms often produce committed reproductive germline cells that will kind new individuals. When reproduction occurs, genes containing DNA space passed along to an organism’s offspring. These genes ensure that the offspring will belong to the same types and will certainly have similar characteristics, such together size and also shape.

Figure \(\PageIndex1\): Reproduction: back no two look alike, these kittens have inherited gene from both parents and also share numerous of the exact same characteristics.


Even the smallest organisms are facility and call for multiple regulation mechanisms come coordinate internal functions, respond come stimuli, and also cope with environmental stresses. Two instances of internal features regulated in one organism are nutrient transport and blood flow. Organs (groups the tissues functioning together) perform particular functions, such as carrying oxygen throughout the body, remove wastes, transferring nutrients to every cell, and cooling the body.

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Figure \(\PageIndex1\): Homeostasis: Polar bears (Ursus maritimus) and other mammals life in ice-covered regions preserve their human body temperature through generating heat and also reducing warm loss v thick fur and a thick layer that fat under your skin.