Which sentence best describes the process of relative dating?

Younger fossils are on top of older fossils.

What evolutionary significance could an alligator have?

it lived both in water and on land

Which BEST explains how geologic time scales can help scientists study the evolution of life on Earth?

They match up the different types of life with geologic events recorded

Which definition describes absolute dating?

measuring the age of an object in years using a specific method

How do scientists use fossils to determine the relative ages of rock layers?

by comparing fossils in many different rock layers

What is a mass extinction?

the disappearance of many species in a short period of time

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Oh how you've grown! Pre-Assess & U3 Q1

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Answers

1
Which sentence best describes the process of relative dating?
Younger fossils are on top of older fossils.
Older fossils are on top of younger fossils.
Fossils are dated by comparing them with living descendants.
Radioactive elements help determine the age of the fossil.
2
T/F: It is common for dead organisms to become fossils.
True
False
3
True/False? There are predictable causes for mass extinctions.
False
True
4
What term describes all of the fossils that have been discovered over time?
fossil database
fossil history
fossil record
fossil file
5
What evolutionary significance could an alligator have?
they're living dinosaurs
they can live a long time
it lived both in water and on land
it has defensive adaptations
6
In what way are eras different from decades?
They are longer spans of time.
They have boundaries marked by mass extinctions.
They have a longer duration than eons.
They are subdivided into epochs.
7
Complete the pattern: Sea to _______.
sedimentary
land
complex
life
8
The proportion of geological time represented by the Precambrian
68 percent
58 percent
78 percent
85 percent
9
What type of life existed during the Precambrian era?
aliens
single celled organisms
humans and current animals
just plants
10
Which BEST explains how geologic time scales can help scientists study the evolution of life on Earth?
They describe the existence of rocks b4 life on Earth and in space.
They compare the life histories of species that used rocks as habitats.
They show geo features occurred at th same rate as th evolution of life
They match up the different types of life with geologic events recorded
11
Which definition describes absolute dating?
determining the age of a rock layer by studying the fossils present
finding the age of an object compared with other objects
measuring the age of an object in years using a specific method
determining the amount of a radioactive isotope in an object
12
Which is the most specific time span?
eon
period
era
epoch
13
Complete the pattern: Simple to _____.
land
complicated
diverse
complex
14
How do scientists use fossils to determine the relative ages of rock layers?
by comparing fossils in many different rock layers
by locating other areas of the world where the same fossils are found
by comparing all the fossils in one rock layer
by determining the positions of fossils in many different rock layers
15
What is a mass extinction?
the result of an exotic species
a rapid increase in biodiversity
a benefit to the environment
the disappearance of many species in a short period of time
16
Complete the pattern: Low biodiversity to _____ biodiversity.
variety
high
land
simple
17
How do sedimentary rock usually form?
in bent swirling bands
in large crystals
in straight vertical layers
in flat horizontal layers

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