Podcast
Questions and Answers
What do geochronologic units represent in the geologic time scale?
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?
Which subdivision of the Geologic Time Scale is the longest?
- Eons (correct)
- Epochs
- Periods
- Eras
What marks the Eras in the Geologic Time Scale?
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?
Why are fossils important in understanding the history of the Earth?
Which subdivision in the Geologic Time Scale can vary from continent to continent?
Which subdivision in the Geologic Time Scale can vary from continent to continent?
How are Eras different from Periods in the Geologic Time Scale?
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?
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?
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?
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?
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?
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?
In which process do individuals exchange genetic material during reproduction, leading to genetic variation in offspring?
