Which of these can cause a change in the size of a population? Fewer young are being born.
A forest is cut down, eliminating a habitat.
Many members of a species die due to a sudden change in climate.
All of these changes can cause a change in population size.

Directions: read the descriptions of the four islands presented in the lesson. 1. list two new traits that each new species of rat might demonstrate as it adapts to the conditions on each island. 2. introduce one of the four new rat species to another island and describe one challenge it would encounter and one success as it adapts to its new environment.