Dictionary » O » Organisms



noun, singular: organism

Living things that are capable of reacting to stimuli, reproduction, growth, and homeostasis.


Plants, animals, fungi and microorganisms are examples of organisms. They all consist of monomeric units called cells. Some organisms may function independently or singly (unicellular) whereas others may form many units (multicellular) divided into specialized tissues and organs. Based on cell type, organisms may be divided into prokaryotes and eukaryotes.

Word origin: Greek - organismos, from Ancient Greek organon , meaning "organ, instrument, tool".
Related forms: organismal (adjective), organismic (adjective), organismically (adverb)
See also: superorganism, microorganism.

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Microevolution verus Macroevolution

... specific iteration of a given gene. Microevolution is defined as variations in the frequencies of alleles below species level, in a population of organisms. Macroevolution is defined as variations in the frequencies of alleles at or above species level, or in populations of populations. The easiest ...

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by hackenslash
Thu Mar 06, 2014 8:57 am
Forum: Evolution
Topic: Microevolution verus Macroevolution
Replies: 15
Views: 17588

A question about what living organisms are made up of.

I know that living organisms are made up of carbon-based molecules and other molecules, I am wondering what is meant by carbon-based molecules? Is it meant that it consists of more carbon than other elements? What other molecules are ...

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by Anonymous99
Mon Mar 03, 2014 1:44 am
Forum: Molecular Biology
Topic: A question about what living organisms are made up of.
Replies: 8
Views: 461

Re: Evolution or De-evolution?

... watch this video: http://www.youtube.com/watch?v=Nwew5gHoh3E Further, you should study the frozen evolution, if you have problem with that. Living organisms always break the second thermodynamic law! What is the point anyway? That we were created because otherwise the second thermodynamics law ...

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by JackBean
Wed Feb 19, 2014 10:18 am
Forum: Evolution
Topic: Evolution or De-evolution?
Replies: 52
Views: 30607

Is incest avoidance selected for?

... know they are not the same thing, but in general, is it genetic? did natural selection select the genes that will create the avoidance behavior in organisms that reproduce sexually?

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by MadMax112
Tue Feb 18, 2014 8:52 pm
Forum: Evolution
Topic: Is incest avoidance selected for?
Replies: 2
Views: 263

How Does Natural Selection Create Ordered Variation?

... going uphill, onwards or whatever. It's only about what's best at the moment. So if an environment changes so that only specifically spezialized organisms have a lot of off springs the population will be uniform after a while. But most of the time it's different things that can increase the fitness, ...

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by Tricho
Wed Jan 22, 2014 1:16 am
Forum: Evolution
Topic: How Does Natural Selection Create Ordered Variation?
Replies: 7
Views: 1391
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