Fossils and the History of Life

Why are the oldest fossils found deeper underground?

¿Por qué los fósiles más antiguos se encuentran a mayor profundidad bajo tierra?

• Less advanced organisms lived deeper underground.

• Deeper rock layers are less suitable for fossilization.

• Fossils move downward as rock layers shift.

• New rock layers are deposited on top of older ones.

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NGSS.MS-ESS1-4

NGSS.MS-LS4-1

The image shows three organisms found in layers of rock. Which statement about the relative ages of the organisms is correct?

• The organism in layer B is the oldest.

• The organism in layer A is the oldest.

• The organism in layer C is the oldest.

• All organisms are about the same age.

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NGSS.MS-ESS1-4

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Which statement about fossils is FALSE?

¿Qué afirmación sobre los fósiles es FALSA?

• Fossils can be preserved remains or trace fossils such as footprints.

• The fossil record is the sum total of what scientists know about fossils.

• Fossils are commonly found because every animal dies and leaves a fossil.

• It is rare to find fossils because very specific conditions are needed for a fossil to form.

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NGSS.MS-LS4-1

The fossil record reveals...

El registro fósil revela ...

• a limited history of life on Earth based on the fossils that have been collected.

• the complete history of animal and plant life on Earth.

• that all animal and plant life on Earth will eventually become fossils.

• that every organism that has ever lived on Earth is still alive today.

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NGSS.MS-LS4-1

Why do scientists find different fossils in different rock layers?

¿Por qué los científicos encuentran diferentes fósiles en diferentes capas de rocas?

• Different organisms lived at different depths underground.

• Rocks change shape after they form.

• Organisms have changed over time.

• Different scientists are doing the digging.

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NGSS.MS-ESS1-4

NGSS.MS-ESS2-3

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Fossils are...

Los fósiles son ...

• always the skeletons or bones of organisms.

• rare because fossilizing conditions are uncommon.

• created after every animal and plant dies and decomposes.

• evidence of every organism that has ever lived on Earth.

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NGSS.MS-LS4-1

A scientist finds a fossil in rock layer A and another fossil in rock layer B. Which statement about the fossils is most likely true?

• The fossil in layer A is larger.

• The fossil in layer A is smaller.

• The fossil in layer A is younger.

• The fossil in layer A is older.

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NGSS.MS-ESS1-4

A species of plant is often used as an index fossil. What are some likely properties of this plant?

Una especie de planta se utiliza a menudo como fósil índice. ¿Cuáles son algunas propiedades probables de esta planta?

• It lived only in a certain location.

• It lived briefly and went extinct.

• It was widespread on Earth.

• It required a lot of water to survive.

In radioactive dating, scientists determine the age of a fossil by...

En la datación radiactiva, los científicos determinan la edad de un fósil mediante ...

• measuring the amount of carbon-14 in the fossil.

• measuring the weight of the fossil.

• comparing the fossil to other fossils found in the area.

• comparing the fossil to currently living species.

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The image shows three rock layers, two of which contain fossils. Which statement accurately describes the relative ages of the fossils in these layers?

• The fossil in layer C is the same age as the fossil in layer A.

• The fossil in layer C is older than the fossil in layer A.

• The fossil in layer C is younger than the fossil in layer A.

• The fossil in layer C may be older than, younger than, or the same age as the fossil in layer A; more information is required.

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NGSS.MS-ESS1-4