Name,from Oldest to Youngest,the Three Groupings into Which the Cenozoic

question 52

Essay

Name,from oldest to youngest,the three groupings into which the Cenozoic is divided.

---

Definitions:

Obsession

A state in which someone thinks about someone or something constantly or frequently especially in a way that is not normal.

Phobia

An irrational and excessive fear of an object, situation, or activity that causes avoidance and distress.

Hypnagogic Image

Vivid, dreamlike images that occur at the onset of sleep.

Compulsion

An irresistible urge to perform an act repeatedly, often irrational and against one's conscious wishes.