The earliest known life forms existed on Earth:
A) 38 million years ago.
B) 544 million years ago.
C) 1 billion years ago.
D) 3.8 billion years ago.
Correct Answer:
Verified
Q18: The _ of the Earth is a
Q19: _ is a principle that states that
Q20: Oceans contain _ percent of the Earth's
Q21: Which of the following is not a
Q22: According to current trends in Earth's population
Q24: The consequence of the vastness of geologic
Q25: _ means that the geologic processes operating
Q26: Water frozen in glaciers is a component
Q27: A _ is a combination of interacting
Q28: The Earth's mantle is found in the:
A)
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