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14 terms

Science Lesson 3a Extinction--10/14/09

STUDY
PLAY
fossil
Evidence of a living thing that lived long ago is called a(n) _____________.
tracks
By observing the patterns of dinosaur ______________, scientists learned how the dinosaurs walked.
rocks
Most fossils are found in _______________.
soft parts
When an organism dies, its _______________ quickly decay or are eaten.
mold
The hard parts of dead organisms are more likely to become a ____________ fossil.
amber
Tree sap can harden into ____________ and preserve an entire organism.
imprint
Some fossils form when an organism presses into a soft surface, leaving a(n) ___________.
change
When an entire group of organisms die, it is probably because they did not adapt to ____________.
disappear
If an organism does not meet its needs after a change, it can slowly __________.
classify
Scientist _____________ living things according to how many of their kind are left.
endangered
If only a few of its kind are left, the species is ______________.
extinct
When no members are left, the species is _______________.
extinct
Scientists try to keep animals from becoming endangered or ____________ by moving the animals to places where they are safe and protected.
protected
Scientists try to keep animals from becoming endangered or extinct by moving the animals to places where they are __________.