Answer:
A
Explanation:
The West contains several major biomes, including arid and semi-arid plateaus and plains, particularly in the American Southwest; forested mountains, including two major ranges, the American Sierra Nevada and Rocky Mountains; the long coastal shoreline of the American Pacific Coast; and the rainforests of the Pacific .
Uniformitarianism
fossils
radioactive decay
48 million
after
The youngest age of the shale is 910 ka. According to the principle of inclusions, the shale formed before the tephra, so the tephra must be younger than 910 ka.
Answer:
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I believe the answer is B
People with an aa genotype will express a recessive trait
