Branch lengths in the tree of life are a measure of the
A) rate of evolution between different species
B) size difference between species
C) life expectancy difference between species
D) amount of genetic difference between different species
Question 2
) Why is the era of nucleosynthesis so important in determining the chemical composition of the universe?
A) All the elements except hydrogen were produced after the era of nucleosynthesis.
B) We can observe spectra from this era to determine what the primordial mix of the elements was at the beginning of the universe.
C) Except for the small amount of matter produced later by stars, the chemical composition of the universe is the same now as at the end of the era of nucleosynthesis.
D) We can study the processes that occurred during the era of nucleosynthesis to determine how most of the elements in the universe were created.
E) By knowing how much matter was created during the era of nucleosynthesis, we can determine whether the universe is open or closed.
The stability of carbon bonds makes life possible even in extreme environments
photosynthesis of a tree "التركيب الضوئي"
Elements of a phylogenetic tree
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