Recent Discoveries of Microscopic Fossils Have Extended the Known History

question 39

Multiple Choice

Recent discoveries of microscopic fossils have extended the known history of life to about:

• A)3.5 billion years ago.
• B)2 billion years ago.
• C)4.5 billion years ago.
• D)1 billion years ago.

---

Definitions:

Type A Personality

A personality style marked by a strong competitive orientation, impatience and urgency, and anger and hostility.

Transient Mental Stress

Refers to temporary states of emotional or psychological stress that come and go, not lasting permanently.

Subsequent Heart Attack

A heart attack that occurs after a person has already experienced one, indicating recurrent cardiovascular issues.

Atherosclerosis

A disease in which plaque builds up inside the arteries, leading to reduced blood flow that can cause heart attacks or strokes.