In what ways is Earth different from the other terrestrial planets?
A) Most of its surface is covered with liquid water.
B) It has oxygen in its atmosphere.
C) Its lithosphere is broken into plates that move around.
D) Life can be found almost everywhere.
E) All of the above are true.
Question 2
Why is the nucleosynthesis era so important in determining the chemical composition of the universe?
A) We can study the processes that occurred during the nucleosynthesis era to determine how most of the elements in the universe were created.
B) By knowing how much matter was created during the nucleosynthesis era, we can determine whether the universe is open or closed.
C) We can observe spectra from this era to determine what the primordial mix of the elements was at the beginning of the universe.
D) All the elements except hydrogen were produced in the nucleosynthesis era.
E) Except for a small amount of elements heavier than helium produced later by stars, the chemical composition of the universe is the same now as at the end of the nucleosynthesis era.
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