Ensatina eschscholtzii is a species of salamander that lives in woodland ecosystems in California, USA. The term species can be defined using different concepts, including the biological species concept and the morphological species concept. The morphological species concept is based on appearance or observable characteristics. Describe what is meant by the biological species concept. . .

Biology

IGCSE&ALevel

CAIE

Exam No：9700_s25_qp_44 Year：2025 Question No：6(b)

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18.1.1 discuss the meaning of the term species, limited to the biological species concept, morphological species concept and ecological species concept

18.1.2 describe the classification of organisms into three domains: Archaea, Bacteria and Eukarya

18.1.3 state that Archaea and Bacteria are prokaryotes and that there are differences between them, limited to differences in membrane lipids, ribosomal RNA and composition of cell walls

18.1.4 describe the classification of organisms in the Eukarya domain into the taxonomic hierarchy of kingdom, phylum, class, order, family, genus and species

18.1.5 outline the characteristic features of the kingdoms Protoctista, Fungi, Plantae and Animalia

18.1.6 outline how viruses are classified, limited to the type of nucleic acid (RNA or DNA) and whether this is single stranded or double stranded

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