espèce (1) spectacle (1) sable (1) modélisation (1) mélanger (1) plomb (1) animal (1) habitat (1) donnée environnementale (1) niche écologique (1) datation (1) ligne (1) Dispersal (1) Dating (1) Origin (1) Squamata (1) Species (1) Sand (1) Psammodromus (1) Population (1) Mya (1) Models and modelmaking (1) Modeling (1) Mixing (1) Lead (1) Lacertidae (1) Example (1) Evidence (1) Conservatism (1) Mixing (1)