As of 2007, What Percent of All U

question 87

Multiple Choice

As of 2007, what percent of all U.S. heads-of-household have never used e-mail?

• A) about 10%
• B) about 15%
• C) about 20%
• D) about 25%

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Definitions:

Species' Song

Vocalizations unique to a particular species that serve various communication purposes, including mating calls and territorial signals.

Young Male Bird

A juvenile avian male in the initial stages of its life cycle, often before reaching sexual maturity.

Exposure

The act or condition of being subjected to an influencing factor or environmental condition, which can affect organisms in various ways.

Group-selection Theory

A controversial hypothesis suggesting that natural selection operates on groups or populations rather than solely on individuals, favoring traits that benefit the group's survival or reproductive success.