Biology for IGCSE & O level - Characteristics And Classification Of Living Organisms (Section 2 - No. 43)
What is the main criterion used to classify organisms into different kingdoms?
Size of the organism
Type of nutrition
Presence or absence of a nucleus
Method of reproduction
Explanation
The presence or absence of a nucleus (prokaryotic vs. eukaryotic cells) is a key characteristic used in the five-kingdom classification.
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