Geologic Time Scale and Mechanisms of Evolution

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What do geochronologic units represent in the geologic time scale?

Divisions based on the age of rocks and sediment

Divisions based on the atmospheric composition

Divisions based on the rotation of the Earth

Divisions based on life-forms that have existed during specific times (correct)

Which subdivision of the Geologic Time Scale is the longest?

Eons (correct)

Epochs

Periods

Eras

What marks the Eras in the Geologic Time Scale?

Types of life existing at a specific time

Differences in life forms from continent to continent

Abundance of certain fossils

Major changes in the fossil record (correct)

Why are fossils important in understanding the history of the Earth?

They provide evidence of life-forms that existed in the past Signup and view all the answers

Which subdivision in the Geologic Time Scale can vary from continent to continent?

Epochs Signup and view all the answers

How are Eras different from Periods in the Geologic Time Scale?

Eras are marked by major changes in the fossil record, while Periods are based on types of life existing at the time Signup and view all the answers

Which mechanism of evolution involves intentional breeding by humans to select for desired traits?

Artificial Selection Signup and view all the answers

What process involves a change in a population's gene pool due to random sampling effects?

Mutation Signup and view all the answers

Which mechanism of evolution results in changes in a population's gene pool due to the movement of individuals between populations?

Gene Flow Signup and view all the answers

What is the term for changes in a population's gene pool that occur due to random events such as the Founder Effect and Bottleneck Effect?

Genetic Drift Signup and view all the answers

Which mechanism of evolution involves the introduction of new genetic material into a population through changes in the DNA sequence?

Mutation Signup and view all the answers

In which process do individuals exchange genetic material during reproduction, leading to genetic variation in offspring?

Recombination Signup and view all the answers

Geologic Time Scale and Mechanisms of Evolution

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Questions and Answers

What do geochronologic units represent in the geologic time scale?

Which subdivision of the Geologic Time Scale is the longest?

What marks the Eras in the Geologic Time Scale?

Why are fossils important in understanding the history of the Earth?

Which subdivision in the Geologic Time Scale can vary from continent to continent?

How are Eras different from Periods in the Geologic Time Scale?

Which mechanism of evolution involves intentional breeding by humans to select for desired traits?

What process involves a change in a population's gene pool due to random sampling effects?

Which mechanism of evolution results in changes in a population's gene pool due to the movement of individuals between populations?

What is the term for changes in a population's gene pool that occur due to random events such as the Founder Effect and Bottleneck Effect?

Which mechanism of evolution involves the introduction of new genetic material into a population through changes in the DNA sequence?

In which process do individuals exchange genetic material during reproduction, leading to genetic variation in offspring?

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