The Viking spacecraft searched for life on Mars by looking for the effects of life on the upper atmosphere.
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Q46: Life emerged from the oceans about _
Q47: The _ molecule is a long carbon-chain
Q48: _ are composed of bacterial mats and
Q49: The _ split lengthwise and duplicate when
Q50: The DNA molecules contain six different bases.
Q52: The unit of heredity is the _.
Q53: The Miller-Urey experiment created synthetic DNA.
Q54: Because of _, _, and _, physical
Q55: Chemical evolution concentrated the various smaller molecules
Q56: Life forms became large and complex during
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