Monday, December 10, 2007

Concept 26.2

Q1: Your measurements indicate that a fossilized skull you unearthed has a carbon-14/ carbon-12 ratio about ¼ that of the skulls of present-day animals. What is the approximate age of the fossilized skull?

A1: 22,920 years (four half-life reductions)

Q2: Based on Table 26.1, how long did prokaryotes inhabit Earth before eukaryotes evolved?

A2: About 1,300 million years, or 1.3 billion years.

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