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Analogous relationship refers to the uses to which parts are put. Relationship of affinity refers either to such a relationship as that of kindred or to an ideal affinity reposing on similarities of structure.

Biological questions are questions referring to living beings, "Biology" being the science which treats of all living things, including both plants and animals.

''Ορνιθυς, a bird, and λo̓γος, a discourse.

''Ερπετo̓ν, a reptile, and λo̓γος.

Βa̓τραχος, a frog, and λo̓γος.