AnswersLollar_8Science_Q1_25-26_RCMagnets and Magnetism

Fossils Answers

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1
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Why is still water an ideal environment for the formation of mold and cast fossils?

A
Sediment builds up over organisms.
B
Sediment turns organisms into rock.
C
Hard tissue decays under sediment.
D
Soft tissue is preserved under sediment.
2
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Which statement explains something that the fossil record indicates?

A
Earth is is still a very young planet
B
Mammals have always existed on Earth.
C
Mass extinctions have occurred several times on Earth.
D
The amount of water on Earth has decreased over time.
3

Which feature do amber fossils have that mold fossils do not?

A
preserved soft tissue
B
organisms turned into rock
C
solid copies of the original organism
D
impressions of hard tissue left by organisms
4

Which correctly lists three materials that preserve soft tissues in fossils?

A
amber, minerals, and sediment
B
minerals, permafrost, and amber
C
permafrost, amber, and tar
D
sediment, minerals, and tar
5

What happens to soft parts of organisms when cast fossils form?

A
They decay.
B
They petrify.
C
They form carbon films.
D
They become part of the fossil.
6

Study the image.

Question illustration
A
It has carbon residue left by a decaying organism.
B
It was formed by tree sap that turned into amber.
C
It was preserved in frozen soil called permafrost.
D
It includes the preserved soft tissue of an organism.
7

Which is a way that paleontologists have contributed to humans' understanding of the history of life?

A
They found evidence that climate has not changed significantly.
B
They grouped organisms by the period in which they existed.
C
They discovered that the first humans lived with dinosaurs.
D
They learned that life has existed since Earth was created.
8

How are casts formed by decaying organisms?

A
Organisms turn into rock over time.
B
Organisms leave carbon residue on a rock.
C
Organisms leave impressions in sediment that hardens into rock.
D
Impressions left by organisms are filled in with sediment that hardens into rock.
9

Which part of an organism is preserved in cast and mold fossils?

A
skin
B
bone
C
muscle
D
soft tissue
10

Study the timeline.

Question illustration
A
130 million years ago
B
1.5 billion years ago
C
2.5 billion years ago
D
4.1 billion years ago
11

The image shows a fossil that is hard like rock but that resembles a tree.

Question illustration
A
This fossil reveals the activities of an organism.
B
This fossil was created in solidifying sediment.
C
This fossil is an impression left by an organism.
D
This fossil was an organism that has been turned into rock.
12

Study the timeline.

Question illustration
A
Humans have only recently existed on Earth.
B
Organisms originally lived only on land.
C
Life on Earth started before water formed on Earth.
D
Multicellular life evolved before complex single-celled life.
13

Some fossils provide evidence to suggest that Earth's climate has changed over time.What information can scientists obtain from these fossils?

A
temperatures
B
number of species that existed
C
movement of continents
D
cause of mass extinctions
14

How do organisms form carbon films?

A
Organisms turn into rock.
B
Residue is left on rocks when organisms decay.
C
Hollow forms are left in sediment by decaying organisms.
D
Organisms leave evidence of their activities, such as footprints.

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