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Large organisms need transport systems to supply all their cells with food, oxygen and other materials.Multi-cellular organisms are too big and not all of their cells have contact with the external environment. All organisms need to exchange substances with their environment - take in needed molecules and get rid of waste. A uni-cellular organism can use the processes of osmosis, diffusion and active transport to transport substances in and out of the organism, which is in this case just one cell. But as organisms increase in size, they need a specialized transport system to exchange substances between the internal environment and the external environment. Interestingly enough, osmosis and diffusion are still the important mechanisms at the cellular level.

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Multi-cellular organisms are too big and not all of their cells have contact with the external environment. All organisms need to exchange substances with their environment - take in needed molecules and get rid of waste. A uni-cellular organism can use the processes of osmosis, diffusion and active transport to transport substances in and out of the organism, which is in this case just one cell. But as organisms increase in size, they need a specialized transport system to exchange substances between the internal environment and the external environment. Interestingly enough, osmosis and diffusion are still the important mechanisms at the cellular level.

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To contact with the external environment

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Q: Why must complex muticellular organisms have transport systems?
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Related questions

Are salmon unicellular?

No, muticellular.


Do bacteria have blood?

No, bacteria do not have blood like more complex organisms. They do not have circulatory systems and rely on other methods, such as diffusion, to transport nutrients and gases within their cells.


What type organisms have water transport systemes?

Plants, specifically vascular plants, have water transport systems called xylem and phloem. These systems are responsible for transporting water, nutrients, and sugars throughout the plant. Aquatic organisms, like jellyfish and sea anemones, also have water transport systems that help with circulation.


How does the list from simplest to the most complex go?

Cells, Tissues, Organs, Organ Systems, Organisms.


What are complex organisms?

Complex organisms are organisms composed of multiple organ systems with specialized functions, such as animals and plants. These organisms are made up of many cells that work together to carry out various physiological processes and respond to their environment. Complex organisms often have more sophisticated structures and behaviors compared to simple organisms.


Are all living things complex?

No, not all living things are complex. Some living organisms, like bacteria and single-celled organisms, are relatively simple in structure and function compared to more complex organisms like plants and animals. Complexity in living things can vary greatly depending on the species and their evolutionary history.


How are complex organisms organized?

Usually, complex organisms consist of many organ systems, which comprise from two or more organs, which is from two or more tissues, which comes from two or more cells working for the common function.


What is an applied science that is concemed with biological systems living organisms or derivatives thereofto make products for specific use?

Complex systems biology


What are the levels of organization of biological systems from siplest to msot complex?

The levels of organization of biological systems from simplest to most complex are: atoms, molecules, organelles, cells, tissues, organs, organ systems, organisms, populations, communities, ecosystems, and biosphere.


What is level or organization?

Multicellular organisms have 5 levels of organization ranging from simplest to most complex...cells, tissues, organs, organ systems, organisms.


What is the difference between simple and complex organisms?

Simple Organism some simple organisms are made of single cell. Others are made of many cells that are similar Complex organisms in complex organisms, cells are organized into tissues, which make up organs. Organs form organ systems.


Do all organisums have an organ system?

No, not all organisms have an organ system. Simple organisms like bacteria do not have organ systems. Organ systems are more commonly found in complex multicellular organisms with specialized tissues and organs.