Chapter 17 History of the Earth and Life

What was the only life present during early Earth?

• microbial
• small multicellular
• plant

What allowed larger, more complex life to form during ancient Earth?

• oxygen in the oceans and atmosphere
• carbon dioxide increased in the atmosphere
• high energy, inorganic compounds

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Fossils form in which type of rock?

• sedimentary
• igneous
• metamorphic

Which is NOT a piece of evidence for ancient life on Earth?

• stromatolites
• banded iron formations
• isotopic ratios resulting from biological processess
• the presence of Earth's atmosphere

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What is the hallmark of eukaryotes?

• organelles
• DNA
• cell membrane (phospholipid bilayer)
• ribosomes

Mitochondria and chloroplasts were probably:

• captured bacteria that carried out important energy processes
• the result of many mutations to the DNA that form ribosomes
• organelles that were important in ancient times but are no longer useful today

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Most species that have ever lived are not living today.

• True
• False

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The normal loss of species through time is generally balanced by the rise of new species. 

• True
• False

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According to the law of superposition, the oldest fossils are found 

• At the top of the rock layers
• Near the bottom of the rock layers
• In the middle of the rock layers
• Somewhat near the surface

According to the law of superposition, which layer is the youngest?

• A
• B
• C