Eukaryotic cells of plants and animals differ from prokaryotic cells in that eukaryotic cells have a

cell wall

cell membrane

vacuole

nucleus

Which flexible structure that supports the nerve cord and led to the backbone

Radiometric dating is used to tell the absolute age of materials by studying the decay rate of radioactive isotopes. the decay rates of isotopes are constant and are expressed as .

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.