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Humans were able to migrate from Asia to North America because...
and land bridge once connected the 2 continents
Ocean
4.5 billion years
Half Life
Migration
Permian
Century
Walk upright
Which of the following is NOT a reason why scientists believe animals such as wooly mammoths and saber toothed cats became extinct?
and land bridge once connected the 2 continents
Ocean
4.5 billion years
Half Life
Migration
Permian
Century
Walk upright
Which of the following is NOT a division on the geologic time scale?
and land bridge once connected the 2 continents
Ocean
4.5 billion years
Half Life
Migration
Permian
Century
Walk upright
A rock with coral and shells in it would have existed in which environment originally?
and land bridge once connected the 2 continents
Ocean
4.5 billion years
Half Life
Migration
Permian
Century
Walk upright
Uranium 238 has a half life of 4.5 billion years. If a 4g sample has decayed to 2g, what is the age of the sample?
and land bridge once connected the 2 continents
Ocean
4.5 billion years
Half Life
Migration
Permian
Century
Walk upright
Which of the following is NOT an advantage mammals have over reptiles?
and land bridge once connected the 2 continents
Ocean
4.5 billion years
Half Life
Migration
Permian
Century
Walk upright
The time needed for one half of an isotope to decay.
and land bridge once connected the 2 continents
Ocean
4.5 billion years
Half Life
Migration
Permian
Century
Walk upright
During which period did the greatest mass extinction on Earth occur?
and land bridge once connected the 2 continents
Ocean
4.5 billion years
Half Life
Migration
Permian
Century
Walk upright
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