Principles of Biology

The Levels of Biological Organization

The Levels of Biological Organization are EVERYTHING!!! The definition of Biological Organization are the levels that make up all of life. Its difficult to explain which levels are most important personally I think that they all have there own importance. Its almost like a chain, you need one for all the rest to work. There are eight levels that are agreed upon and have classification's under them.


Knowing these levels is important, Its good to know what makes up of certain aspects of life.

The first level, and smallest is the molecular level. This includes DNA. Molecular level also includes cells, the smallest unit of life capable of carrying out the functions of living things. This could also be the chemical level.

Tissue level is what comes next. This is a group of similar cells that perform a certain function.

Organ level, next in line. This is several different types of tissues that function together to do a certain job. This is like your blood and vessels.

Organ system level, are several different organs working together for a specific function. This could include your digestive system or circulatory an etc.

Population level, the actions of individual organisms and there interactions together. This is an area defined by one species.

Community level, which is opposite of the population because this level is an area defined by all loving things. Like you have your grass community; which would be all the living things that are in that place like the grass, weeds, insects, an etc.

Ecosystem level, an this includes the community plus all the non-living factors as well.

Biosphere level is all the ecosystems together.

So each level ties into the next you cant have one without having the other. Knowing how to tell the difference helps because you should be able to tell what falls under each category each one. This will help further your knowledge and understanding of science.

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Comment by Abby Lucas on October 7, 2008 at 10:26pm
The way you compared Biological Organization with a chain made it a bit easier to understand. Because you kept each category relativly simple, it made it easier to remember and, again, easier to understand. I think the overall main ideas would be the entire concept of Biological Organization and how each level ties to the next.
Comment by Matt Brown on October 8, 2008 at 9:48am
I like how your kept every level simple when you explained them, it adds to the ability to understand the levels. Although with that said, I don't agree with the statement "There are eight levels that are agreed upon .."because if you look at other charts of the levels you'll see that others break it down into other levels such as sub-atomic. But overall, good job!
Comment by meagan on October 9, 2008 at 12:58pm
I really like the chart that you used here. A visual and simple descriptions really helped me to understand what you were explaining. I think that the two main ideas were the Levels of Biological Organization and how they are important,
Comment by Tori Scott on October 9, 2008 at 8:47pm
yea i could have worded that better but overall there are eight levels always used... but some choose to add others in and go deeper into it. But there are eight basic levels

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