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Why is it difficult to find fossils representative of the time that life began on Earth?

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Fossils this old are difficult to recogn...

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_______________ are fossilized remains of colonies of single-celled organisms that built up layer after layer of trapped sediments.

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Can there be life on Mars? Is there proof that life existed on Mars? Defend your answer.

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There was a splash of news stories in th...

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Half the stars in the Milky Way Galaxy are members of a binary system, many of which are likely to support life on planets.

A) True
B) False

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The formula proposed for determining the number of technological civilizations in the Milky Way Galaxy with which we might communicate, is known as the _______________.

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Which describes the direct change in genetic information of a cell?


A) chromosome
B) mutation
C) evolution
D) natural selection
E) heredity

F) A) and D)
G) A) and C)

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What prevents Titan from being a candidate for supporting an evolution of life?


A) It is too far from the Sun.
B) Its atmosphere doesn't contain the right mixture of elements.
C) Its surface is covered in methane lakes.
D) Its surface temperature is too cold.
E) It is tidally locked to Saturn rather than the Sun.

F) None of the above
G) All of the above

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What makes silicon an unlikely source as the basis of life?

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Though similar in structure to carbon an...

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