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because multicellular organisms cannot survive on diffusion alone. as a result, they need these mechanisms to transport nutrients and substances through the body
A cat is multicellular. Multicellular organisms have more than two cells. A multicellular organism is one that can be seen without the need of a microscope.
Respiration need transportation of respiratory gases. This is done by circulation system
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because multicellular organisms cannot survive on diffusion alone. as a result, they need these mechanisms to transport nutrients and substances through the body
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A cat is multicellular. Multicellular organisms have more than two cells. A multicellular organism is one that can be seen without the need of a microscope.
Respiration need transportation of respiratory gases. This is done by circulation system
Respiration need transportation of respiratory gases. This is done by circulation system
The first multicellular life does not need oxygen. That is the only type of life that does not need any oxygen at all basically. It is because a lot of organisms do not need the respiratory system at all.
We need to be multicellular, because we need all the different types of cells for what our body's systems do. Being multicellular gives humans more capabilities that other organisms might not be able to do. Humans would not be built the same way that we are now if we were not multicellular, we would have a lot less functions.
Oxygen, nutrient, waste, etc transportation around the body. Check out the Circulatory system
construction of a reliable transportation system for the United States.
As we are multicellular organism so we need different types of organs to perform all functions of our body. In multicellular organisms, all cells may not in the direct connect with the surrounding environment . Therefore, the diffusion is insufficient to meet the oxygen requirements in them. Instead, they need specialized organs for breathing and exchange of gases like heart ,lungs etc.
Complex multi cellular organisms need a nervous system to be able to contact the brain and be informed on which tasks need performing. Hope this helps...