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In single-celled organisms the entire surface of the organisms is in contact with the environments for the diffusion of substances. In multi-cellular organisms all the cells may not be in direct contact with the surrounding environment. So simple diffusion will not meet the requirements of all the cells.

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Why is diffusion possible in unicellular organisms not in multicellular organisms?

It is possible in multicellular but not effective .


Why is diffusion insufficient meet the oxygen requirements of multicellular organisms like humans?

In single-celled organisms the entire surface of the organisms is in contact with the environments for the diffusion of substances. In multi-cellular organisms all the cells may not be in direct contact with the surrounding environment. So simple diffusion will not meet the requirements of all the cells.


Why is diffusion insufficient to meet the oxygen requirement for multicellular organisms like human?

In single-celled organisms the entire surface of the organisms is in contact with the environments for the diffusion of substances. In multi-cellular organisms all the cells may not be in direct contact with the surrounding environment. So simple diffusion will not meet the requirements of all the cells.


Why do you need various system in human body?

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.


What transport mechanism do one celled colonial and simple multicellular organisms rely on?

These organisms use simple diffusion as a transport mechanism.This is possible because of the small size of the organisms. Diffusion is effective over small distances but as size increases it becomes less and less efficient.


Why can't all waste products be diffused by multicellular organisms?

All waste products are removed, they may not go by diffusion alone.


Types of multicellular organisms?

ten multicellular organisms


All multicellular organisms are called?

There are many examples of multicellular organisms. Us humans are multicellular, animals are multicellular. Smaller organisms are unicells.


Are fish multicellular organisms?

Yes, fish are multicellular organisms


Are multicellular organisms prokaryotic or eukaryotic?

Multicellular organisms are eukaryotic.


Are sponges multicellular organisms?

Yes, sponges are multicellular organisms.


Are sponges unicellular or multicellular organisms?

Sponges are multicellular organisms.