Answer:
What happened for this snake to become extinct was the development of human activities that damaged the habitat where this snake lives, which caused the death of several members of this species.
Step-by-step explanation:
South Florida rainbow snake lived in aquatic environments, where they spent most of the time submerged in water, hidden among water plants and even among the roots of trees that come into contact with water. However, the advance of human activities, caused pollution of aquatic environments, stimulated the occurrence of droughts, created dams, among other activities that destroyed the habitat of these snakes, preventing them from having access to shelter, food and being visible to predators. This caused these snakes to die on a large scale, coming close to being extinct.