Explain how organisms have overcome the challenges of being multicellular. 

Explain how organisms have overcome the challenges of being multicellular.

These challenges have been overcome in the followings:

• There is division of labor, different cells being adapted to perform specific functions. This has improved efficiency in co-ordination of life-sustain process.
• Specialized respiratory surfaces have been developed to enhance gaseous exchange
• A specialized transport system has been developed to move gases and other materials to and from the body cells. For example, in higher plants and animals
• In some, the body is flattened, thus reducing between the two body surfaces enhancing the process of diffusion. For example, in flatworm and leaves of plants
• A specialized supporting system such as a skeleton in most animals has been developed to provide support, protect and assist locomotion of the organism.
• In some, the body is constructed such that the tissues are thin. This reduces the diffusion distance. For example, in hydra.
• In some, there exist a system by which the external medium is brought into the body so that it comes into intimate contact with all tissue in order to enhance exchange of materials by diffusion. For example, tracheal system.

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