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why are there many fossil imprints of ferns?
 
Once, most plants on Earth were ferns.
 
Fern parts are hard like bone.
 
Ferns have changed little over time.
 
Ferns were larger than other ancient plants.
What replaces the wood of a once-living tree to form petrified wood?
 
minerals
 
amber
 
a cast
 
a mold
Which animal is extinct?
 
saber-toothed cat
 
camel
 
elephant
 
rhinoceros
Why don't we know what many ancient plants looked like?
 
They rotted away.
 
Animals ate them all.
 
Minerals destroyed them.
 
They were trapped in tar.
Which of these must happen first for a fossil to form?
 
A plant or animal is covered by sediment.
 
Sediments fill a mold and form a cast.
 
A plant of animal is eaten.
 
Sediments are pressed together and hardened.
Which sentence is TRUE?
 
Some living things have not changed in millions of years.
 
All once-living organisms left behind fossils.
 
Fossils show that camels have not changed.
 
Fossils show that the coelacanth fish has changed.
How are an elephant and a mammoth alike?
 
both have tusks
 
both are extinct
 
both have thick, shaggy fur
 
both live in a warm climate
Which term describes this fossil?
 
mold
 
amber
 
cast
 
bone
If scientists found this fossil, what could they infer?
 
that water once covered the area
 
what fish were like today
 
that this fish lacked oxygen
 
what kind of animal ate this fish
A fossil animal has a mouth full of sharp, pointed teeth. What can you infer about the animal?
 
The animal ate meat.
 
The animal ate fruits and vegetables.
 
The animal is closely related to a shark.
 
The animal did not live on land.
In which type of rock are most fossils found?
 
sedimentary
 
igneous
 
volcanic
 
metamorphic
Which is an imprint fossil?
 
an animal track
 
bone
 
Petrified wood
 
a cast
Which type of fossil would look like an actual body part of a once-living thing?
 
a cast
 
a trace
 
a mineral
 
a footprint
Why are there more animal fossils than plant fossils?
 
Plants have softer body parts than animals.
 
Animals eat plants.
 
Plants are smaller than animals.
 
There were more ancient animals than ancient plants.
The hardened remains of living thing that died long ago.
 
Fossil
 
Extinct
A group of living things that is no longer living.
 
Extinct
 
Fossil