Biology Chapter 17 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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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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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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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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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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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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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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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.

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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