In any population there is always variation in the characteristics of the organisms. , These variations are caused by random mutations in the organism's DNA, These mutations could help some of the organisms to survive if their environment changes, eg a new disease or predator., These organisms will survive and reproduce, passing their genes to their offspring.,

Lestvica vodilnih

Vizualni slog

Možnosti

Preklopi predlogo

Obnovi samodejno shranjeno: ?