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EcosystemFive KingdomsHuman ActivityInheritanceNutrient CyclePhotosynthesisSelectionVariation

Definition of species (basic unit of classification):

The five-kingdom classification of organisms

Prokaryotae (prokaryotes)

Protoctista (protoctists)

Fungi

Plantae (plants)

Plant kingdom has two different types of adults in their life cycle

Animalia (humans, animals)

Viruses → acellular → not included in classification system → pathogenic