When Estimating the Number of Technologically Advanced Civilizations in Our

question 21

Multiple Choice

When estimating the number of technologically advanced civilizations in our Galaxy,it is useful to consider

• A) the average life span of an alien.
• B) the average life span of the civilization.
• C) the distance to the civilization's planet.
• D) the type of advanced communication they use.

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Definitions:

Social Support

The perception and actuality that one is cared for, has assistance available from other people, and that one is part of a supportive social network.

Lymphocyte Levels

A measure of the concentration of a type of white blood cell in the blood, which plays a crucial role in the immune response.

Cortisol Levels

The concentration of cortisol, a steroid hormone, in the blood, which can change in response to stress or low blood-glucose concentration.

Epinephrine Levels

The concentration of epinephrine, a hormone also known as adrenaline, in the bloodstream; involved in the body’s fight-or-flight response.