All of Geologic Time Prior to the Beginning of the Paleozoic

question 94

Short Answer

All of geologic time prior to the beginning of the Paleozoic era is commonly referred to as the ________ era.

---

Definitions:

Negative Intrapleural Pressure

The sub-atmospheric pressure within the pleural cavity that helps keep the lungs inflated by maintaining a vacuum.

Intrapulmonic Pressure

The pressure within the lung alveoli, important in the process of breathing as it affects the intake and release of air.

Ankle-Brachial Index (ABI)

A calculated number that indicates the amount of arterial blood flow to the extremity.

Systolic Pressure

The pressure of the blood against the arterial walls when the ventricles of the heart contract.