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Exam 14: Life, Death and Evolution

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Question 31

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About 1.4 billion years ago, the aerobic eukaryotes emerged.

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Question 32

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During the __________ Eon, there was no free oxygen in the Earth's atmosphere.

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Question 33

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Neanderthals disappeared about

Mutations can be considered as one of the components of evolution because they

In which era do we see human evolution?

All of Earth's water, land, and atmosphere that contains and supports life is known as

The Neanderthals disappeared about 30,000 years ago and were replaced by the first members of our own species, Homo sapiens.

There are six-kingdoms in the system of taxonomic classification.

The oxygenation of the atmosphere by early photosynthetic organisms was a major environmental change that provided many new opportunities for diversification.

DNA consists of two chainlike molecules called biopolymers. What are the structural units that are stacked together in the DNA molecule called?

The most ancient known fossils are 4.6 billion years old, found in rocks from the Archean Eon.

One of the requirements for multicellular organisms to survive on land is a means for exchanging gases with air.

An organism's genetic sequence can also change through __________ , which happens spontaneously during the passage of genes from parents to offspring and can also be caused by environmental factors.

Speciation nearly always requires some form of

Where do the salts in the ocean come from? How does this affect the chemistry of both the ocean water and the atmosphere?

___________ study the fossilized remains of ancient plants and animals.

What type of events are typically seen in the fossil record?

Living organisms do not have the potential to adapt and to develop into new life forms, or species.

When did free oxygen begin to accumulate in the Earth's atmosphere?

__________ is the permanent disappearance of a species, and is widespread over the duration of Earth's history.