Biological Levels in Biology: The World Tour


Captioning is on. Turn off by clicking the CC button at bottom right! Follow us on Twitter (@AmoebaSisters) or Facebook! If I asked you to describe the biological
levels of organization, could you do it? What would those levels be? Actually, what would
be the point about caring about it in the first place? Biological systems are composed
of many levels. We care about them because when these levels are analyzed, it’s possible
to relate the levels not only to each other, but the whole system. All of our videos tend
to focus on one or more of these levels which is why we have chosen to make this our first
video in our biology playlist. The first level that we are going to start
with is the most basic, living level that makes up all of life. It is…the cell. Can
something be smaller than a cell? Sure. For the cells that contain organelles, the organelles
are obviously smaller than the cell they are contained in. Biomolecules are smaller than
cells. We learn about biomolecules as they are major, nonliving components within cells.
Atoms are smaller than a cell. You can even get smaller than atoms when considering subatomic
particles. But for this video, we’re going to start at the cellular level, a basic living
unit. It doesn’t matter whether you’re a bacterium, arcaheon, fungus, protist, plant,
or animal—if you’re alive, you are made up of cells. When you have a lot of cells that work together
for a combined function, you end up with the next level: tissues. An example of tissue
includes cardiac muscle tissue, which would be made up many cardiac muscle cells. Tissues make up organs, which is our third
level. You have a lot of organs in your body. An example of an organ would include your
heart. When you have multiple organs working together
in a body, you end up with an organ system. Consider the digestive system. It includes
your stomach, the small intestine, the large intestine, liver, etc…these particular organs
work together to help you digest your food and use food for the energy you need for all
kinds of cell processes. The digestive system is just one example of an organ system. But tie in all of the organ systems and what
do you get? An individual. An organism. Like you! Or, this platypus. He’s got organ systems
too. Put many platypus together…what’s the
plural of platypus…according to dictionary.com, you can say platypi which sounds especially
fancy…and you have a population. This population of platypi can breed with each other. They’re
all the same species. It’s a platypi population. That’s a great YouTube channel name right
there. But include other populations such as fish,
algae, and plants along with the platypi and now you have a community. A community includes
many populations, but it does not include abiotic features. Abiotic features are features
that are nonliving. Like rocks. Abiotic factors are NOT considered in the community level,
just biotic factors. Biotic factors, on the other hand, are living. When abiotic factors are considered, such
as the rocks, the temperature of this environment, the water, and the biotic factors such as
all the organisms we mentioned before, now we have an ecosystem. Well it turns out that many ecosystems can
be found in different regions on the globe. If talking about this collectively, you are
at the level of biome. An example is a desert biome or a rainforest biome. You will find
desert ecosystems or rainforest ecosystems in multiple places on the globe. When talking
about a desert biome or rainforest biome, you are considering these ecosystems. What happens when you put all the biomes together?
You are now considering our planet, the Earth—which talking about the level of biosphere. The
biosphere is the sum of all of these biomes—all the areas where organisms live. We’re finished with our tour of the biological
levels of organization, but this is just an overview. The more biology you learn, the
more you will discover how these levels relate to each other…and the whole system. That’s
it for the Amoeba Sisters and we remind you to stay curious!

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