Most mutations occur because of exposure to artificial external agents, such as radiation.
Answer the following statement true (T) or false (F)
False
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There is no evidence in the geologic record that multi-celled organisms of any kind existed prior to the Cambrian
Indicate whether the statement is true or false
Soil develops ____
A)faster on bedrock than it does on unconsolidated sediment B)faster on unconsolidated sediment than it does on bedrock C)often with no weathering involved D)at similar rates throughout the world E)a distinct purple color when it has a high iron content
Approximately ________% of U.S. citizens live in coastal counties and are thus vulnerable to storm surges and a rise in sea level
A) 83 B) 95 C) 10 D) 20 E) 53
Clouds and precipitation patterns are often clues to the position of a front
Indicate whether the statement is true or false