A unicellular organism is any life form that is composed of a single cell; they live and carry out all life processes as a single cell. Based on their complexity, unicellular organisms can be placed in one of two categories: eukaryote and prokaryote. Most unicellular organisms are microscopic, but some are visible to the naked eye.Continue Reading
Eukaryotes have a simple cell structure compared to prokaryotes. The prokaryotic unicellular organism does not have a cell nucleus, while the eukaryotic unicellular organism has a nucleus within the cell. The evolution theory suggests that unicellular organisms were the first living things on earth, existing approximately 3.8 billion years ago.
Unicellular organisms pursue different strategies for survival, including heterotrophy (amoeba), chemotrophy and photosynthesis (cyanobacteria). Unicellular organisms include most life on earth and can be found in virtually every habitat, including the least hospitable conditions. Common examples of unicellular organisms include: cyanobacteria, bacteria, paramecium and amoeba. Most single-celled organisms live in colonies, but each organism remains self-sufficient.
The opposite of a unicellular organism is a multicellular organism. Multicellular organisms are typically larger and require specialized organ systems. They require complex organ systems to facilitate communication between cells, control exchanges with the external environment and supply the cells with the required nutrients.Learn more about Biology
A decomposer is an organism that feeds on dead organisms and the waste products of other organisms. Decomposers help nutrients cycle back into the ecosystem. Some examples of decomposers are insects, earthworms and bacteria.Full Answer >
Organic foods are grown using traditional growing methods that promote environmental health and without chemical fertilizers, pesticides and industrial processing, and genetically modified organisms are plants or animals that have been modified using genetic engineering techniques to directly alter the organism's DNA. While GMOs can be grown using organic techniques, the genetic modification generally renders the plants ineligible for the organic label.Full Answer >
In the trophic structure, classification of organisms in an ecosystem occurs through the energy source and consumption of food by an organism. The trophic structure represents the relationship between species and food sources.Full Answer >
If both organisms in a symbiotic relationship are executing an action, then one organism's actions benefit the other organism in the dynamic. The name for this type of symbiotic relationship is mutualism.Full Answer >