Why is phosphorus so essential to living organisms? ?

The transport tubes from food came down the plant are called?

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 label correctly identifies what x represents in the concept map?