Which of the circulatory system disorders are considered to be vascular?

What was the land like over 500 million years ago? what was under the sea?

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 organisms udergo photosynthesis