A snake species that has migrated from the mainland to a small island eats banana slugs instead of lizards and mice, its usual diet. Which statement best explains this change in behavior? 1. The genotype that affects food choice is not isolated to a single phenotype.

2. Instinctual food choice by snakes is not related to genotypic flexibility.

3. Diet is exclusively controlled by snake genetics, not by nature.

4. Gene expression for mainland snakes is rigid and confined to one phenotype.