Which atmospheric gas is used by marine organisms to make their shells?

Which statements are true of a scientific theory but not a hypothesis

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.

Which organism can most likely be classifild as domain bateria