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Organisms that are larger require the respiration of something like oxygen to capture enough energy to run themselves.

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Q: Why are most anaerobic organisms very small?
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Most small disease causing organisms are very small or large?

small


What is the process called by which organisms are responsible for producing nitrogen compounds?

Nitrogen fixation. It can only be performed by a very small number of species of anaerobic bacteria.


Very small organisms in the ocean?

bacteria


What is a species if its organisms are found in very small numbers?

If a species is endangered, the organism will be found in very small numbers.


Organisms that are poisoned by oxygen and must live in very low oxygen regions are called?

Obligate anaerobes are poisoned by O2 and use fermentation or anaerobic respiration


Are micro organisms living things?

'organisms' because they are living things, 'mirco-' means very small.


Why does aerobic metabolism have an advantage over anaerobic metabolism in living things?

Aerobic respiration produces more energy than anaerobic respiration(about 25x more)


Do organisms have to produce oxygen to be considered a living thing?

I think you are meaning if organisms don't need oxygen are they still living things? The answer would be yes they are. There are plenty of anaerobic bacteria around. Anaerobic meaning that it lacks oxygen. Bacteria are single cell organisms that are very much alive, but there was also a recent discovery in 2010 where they discovered a multicellular organism that doesn't require oxygen as well it's a species of Spinoloricus.


How can living organisms and most materials on earth be composed of just a few elements?

living things need other elements but very small amounts


How can living organisms and most materials on Earth be composed of just few elements?

living things need other elements but very small amounts


What is the meaning of micros?

very very small . for example MICROScopic organisms are so small that they may only be viewed under a magnifying glass.


Are microorganisms dead organisms that you cannot see?

No just very small ones