The Drake Equation Allows Us to Estimate the Number of

question 13

Multiple Choice

The Drake equation allows us to estimate the number of

• A) intelligent civilizations that have existed in our galaxy during its entire lifetime
• B) habitable planets on which life has arisen
• C) intelligent civilizations capable of traveling to the Earth
• D) intelligent civilizations capable of communicating in our galaxy now

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Definitions:

Linnaeus

Carl Linnaeus, an 18th-century Swedish botanist, physician, and zoologist who developed a system for naming, ranking, and classifying organisms.

Primates

Primates are an order of mammals that includes humans, apes, monkeys, and prosimians, characterized by complex behaviors, varied forms of locomotion, and a large brain relative to body size.

Hominids

Primates characterized by bipedalism and large brains, including the human lineage and all our immediate ancestors.

Genus

A rank in the biological classification system (taxonomy) that is used to group species sharing common characteristics, directly above species and below family.