What are we referring to ? When we say 'simple organisms' or 'complex organisms'.
What are we referring to ? When we say 'simple organisms' or 'complex organisms'.
$\rightarrow$ When we say simple or complex organisms we are talking in terms of evolutionary history of an Organism. A 'simple organism' is considered to be primitive and has simple thallus organisation;
The level of complexity of metabolism is also low.
On the other hand a 'complex organism' refers to a more evolved form forming higher levels of structural and functional complexities. They are believed to have arisen from simple organisms.
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- [AIPMT 2002]
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