Question

which organisms are called primitive and how are they different from the so- called advanced organisms?​

Answer 1

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$\sim$$\huge\underline\mathcal {Primitive\:organism}$

$\implies$Primitive organisms are also called as lower organisms because they are less complex and they are prone to undergo changes in their bodily functions and structures. For example, single cell organisms are primitive organisms and the eukaryotic organisms are said to be the advanced forms of the primitive organisms.

$\implies$Single cell organisms are primitive organisms and the eukaryotic organisms are said to be the advanced forms of the primitive organisms.

$\implies$Primitive organisms are also called as lower organisms because they are less complex and they are prone to undergo changes in their bodily functions and structures.

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$<marquee \: behavior = alternate><font \: color=gold>- Itzgod❗$

Answer 2

Yes. Complex organisms are the same as advanced organisms. The consequence of advancement leads to multiple cell arrangements that operate uniquely.