Which of the following is not key evidence in support of the idea that all life today shares a common ancestor?
A) Mapping of gene sequences shows how life is all related.
B) All life builds proteins from the same amino acids and uses ATP to store energy in cells.
C) We have identified fossils of the first life forms that ever existed on Earth.
D) All life uses DNA and the same genetic code.
Question 2
Which pair of ball-drop experiments will best test whether mass affects the acceleration of gravity?
Exp 1. Mass 0.5 kilograms, height 20 meters
Exp 2. Mass 5.0 kilograms, height 20 meters
Exp 3. Mass 0.5 kilograms, height 30 meters
A) Exp 1 and 3 B) Exp 1 and 2 C) Exp 2 and 3
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