What is an organism? An organism is a complex, organized structure that exhibits characteristics of life. These characteristics include the ability to grow, reproduce, respond to stimuli, adapt to the environment, and undergo metabolism.
Trisha Sullivan, the wastewater treatment operator 2, examines the water specimens from Puffer’s Pond inside an incubator at the town’s Wastewater Treatment Plant lab Wednesday. Puffer’s Pond, a ...
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Several criteria, few of which are widely accepted, have been proposed to define what constitutes an organism. Among the most common is that an organism has autonomous reproduction, growth, and metabolism. This would exclude viruses, even though they evolve like organisms.
Organisms are characterized by their ability to perform life processes, which distinguish them from non-living entities. In the vast tapestry of life on Earth, organisms are categorized into an intricate hierarchy of groups that reflect their genetic relationships and evolutionary history.
One of the ways is by basing upon the number of cells that make it up. The two major groups are the single-celled (e.g. bacteria, archaea, and protists) and the multicellular (animals and plants). Organisms can also be classified according to their subcellular structures.
Our first task is to try to define what an organism is. Let us start by looking at things that might be considered organisms: Fig. 1 How many different organisms and kinds of organisms do you see? The most obvious organisms are the moose. Their structure and development make their organismal nature easy to define.