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10
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Why doesn’t the fossil record show all organisms that have ever existed?
All organisms are equally likely to become fossils
Scientists have already found every fossil on Earth
Most organisms never lived long enough to be important
Fossilization is rare, soft-bodied organisms decay, and many
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15
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What is the significance of the “digits” in the pattern?
They make the limb shorter
allow animals to swim, walk, climb, or manipulate objects
They are just for decoration
They are only found in humans
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20
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remains of the actual organism; shells, bones, teeth preserved
body fossil
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20
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the remains of ancient organisms
fossil
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20
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any living thing that can carry out life processes on its own
organism
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15
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Why are land plants important in evolution?
They could fly
They replaced fish in oceans
They produced shells for protection
They allowed animals to colonize land
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heart
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magnet
Take 25 points!
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rocket
Go to first place!
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banana
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15
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Which statement best describes biodiversity?
Only marine animals existed until the Mesozoic
Stayed the same until humans appeared
Dinosaurs were the only contributors to biodiversity
it gradually increased when animals moved onto land
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20
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Fossilization requires certain conditions. Which of the following helps a fossil form?
Being eaten by predators
Exposure to air and sunlight
Rapid burial in sediment
Floating on the ocean surface
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20
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traces of organisms' activities; burrows, footprints, drag marks
trace fossil
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10
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During which period did the first tetrapods appear?
Cambrian
Devonian
Ordovician
Silurian
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monster
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shark
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shark
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thief
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25
15
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Which of the following animals does NOT follow the one → two → many → digits pattern?
Fish
None of the above; all follow the pattern
Humans
Amphibians
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10
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Which of the following can studying embryos help scientists understand?
How species may be related through common ancestors
The exact color of an adult animal
Which species is the smartest
How fast an animal can run
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heart
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gift
Win 5 points!
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shark
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banana
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15
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Why didn’t the soft parts of early animals usually fossilize?
Soft tissues decayed or were eaten before they preserved
Soft parts were too small to be seen by scientists
Early animals lived only on land, far from where fossils for
Fossils can only form in very cold climates
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