The fundamental explanation for the cause of cancer is that

cell replication becomes uncontrolled

viral or bacterial antigens infect a body that cannot destroy them

a recessive genetic disorder is expressed in both alleles

cells no longer replicate and become non-functioning

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.