Answers SY2025-26 - 2002070 MJ Comprehensive Science 2 Sem 1 CRUnit Test

The Fossil Record Answers

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The diagram shows fossils buried in layers of sediment.

The fossil in layer Z is the youngest.

The fossils in layers Y and Z are younger than the fossil in layer V.

The fossil in layer Y is older than the fossil in layer W.

The fossil in layer X is older than the fossil in layer Z.

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The diagram shows two different types of fossils from the same kind of ancient organism.

X: moldY: cast

X: castY: mold

X: traceY: imprint

X: imprintY: trace

Compared to absolute dating, what is an advantage of relative dating?

A single fossil can be dated by itself.

The actual age of a fossil can be determined.

Fossils do not need to be arranged in different layers of rock.

There is no limit to the age range of the fossils being dated.

Jonas drew a diagram to compare two types of fossils.

Involves minerals replacing remains of organism

Takes millions of years to form

Gives evidence of organism’s activity

Forms as sediment hardens

mammalsbacteriacells with a nucleusmulticellular organisms

mammals

bacteria

cells with a nucleus

multicellular organisms

The diagram shows fossils buried in layers of rock.

Trilobites and gastropods are the youngest fossils.

Crinoids and gastropods have lived during the same time period.

Ferns have existed for a longer period of time than coral.

Every ammonite fossil is older than the gastropod fossils.

Which pair of elements can be used to determine the age of a fossil that is over one billion years old?

lead, which is radioactive, and uranium, which is stable

carbon, which is radioactive, and nitrogen, which is stable

argon, which is radioactive, and lead, which is stable

potassium, which is radioactive, and argon, which is stable

A scientist is using relative dating to determine the age of a fossil that she discovered.What would allow her to draw the best conclusions about fossils that are younger than the one she discovered?

measuring the amount of carbon and nitrogen in the surrounding rock

measuring the amount of potassium and argon in the surrounding rock

finding fossils in the same area that are in layers deeper under the surface

finding fossils in the same area that are in layers closer to the surface

How much time is needed to form most fossils?

a few months

a few years

hundreds of years

millions of years

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The Fossil Record Answers

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