Module 3: Evidence of Evolution

What is the process called when minerals replace an organism’s original material to form a fossil?

• Carbonization

• Mineralization

• Mold formation

• Preservation

Answer explanation

The process called mineralization occurs when minerals replace the original material of an organism, preserving its structure and forming a fossil. This distinguishes it from other processes like carbonization or mold formation.

Fossils can only form from the hard parts of organisms such as bones and shells.

• True

• False

Answer explanation

The statement is false because fossils can also form from soft parts of organisms under certain conditions, such as in amber or through exceptional preservation, not just from hard parts like bones and shells.

The preserved evidence of an organism's activity, such as footprints, is called a __________ fossil.

Answer explanation

The preserved evidence of an organism's activity, like footprints, is known as a trace fossil. This term specifically refers to indirect evidence of an organism's behavior rather than the organism itself.

Which of the following is NOT a way a fossil can form?

• Freezing in ice

• Burning in fire

• Trapping in amber

• Preserving in tar pits

Answer explanation

Burning in fire does not lead to fossil formation, as it destroys organic material. In contrast, freezing in ice, trapping in amber, and preserving in tar pits are all valid fossilization processes.

Which statement best describes what the fossil record shows?

• Fossils only show the present-day species.

• The fossil record documents life forms' diversity and changes over time.

• Fossils only tell about the Earth's climate.

• Fossils have no relationship to species' extinction events.

Answer explanation

The fossil record provides evidence of the diversity of life forms and their evolution over time, showing how species have changed and adapted, making the second statement the most accurate.

Tags

NGSS.MS-LS4-1

Most fossils are dated by finding the absolute age of the rocks they are in.

• True

• False

Answer explanation

True. Most fossils are dated by determining the absolute age of the surrounding rocks, which helps establish a timeline for when the organisms lived.

Tags

NGSS.MS-ESS1-4

What are two main methods scientists use to date rocks?

Answer explanation

Scientists primarily use radiometric dating, which measures the decay of radioactive isotopes, and relative dating, which determines the age of rocks based on their position in layers and the fossils they contain.

Tags

NGSS.HS-ESS1-5

What is the geologic time scale?

• A list of all the known fossils on Earth.

• A chart dividing Earth's history into different time units.

• A measurement of the Earth's size.

• A record of all volcanoes.

Answer explanation

The geologic time scale is a chart that divides Earth's history into different time units, such as eons, eras, and periods, helping to organize and understand the timeline of geological events and life on Earth.

Tags

NGSS.MS-ESS1-4

The geologic time scale divides Earth's history into different time units called __________ and __________.

• eras

• periods

Answer explanation

The geologic time scale is divided into major time units called eras and periods. The correct answer is 'eras', as it is one of the primary divisions used to categorize Earth's history.

Tags

NGSS.MS-ESS1-4

Extinctions have only occurred once in Earth’s history.

• True

• False

Answer explanation

Extinctions have occurred multiple times throughout Earth's history, including the well-known mass extinctions. Therefore, the statement is false.

Tags

NGSS.MS-LS4-1