vertébré (1) spectacle (1) serpent (1) reptile (1) séparation des masses (physique) (1) lézard (1) fruit (1) évolution (1) dosage (1) âge (1) compensation (1) machine (1) Case (1) Amniotes (1) Genes (1) Y chromosome (1) X chromosome (1) Work (1) Wages (1) Sex chromosomes (1) Sex (1) Pensions (1) Human beings (1) Mammals (1) Males (1) Machinery (1) Lysine (1) Lizards (1) Hypothesis (1) Grammar, Comparative and general--Case (1)