According to the model, when was the universe at its most dense? A)
During the Dark Ages where matter increased in mass.
B)
Just before the Big Bang where all matter existed in a singularity
C
During the nuclear fusion events, as the atoms become more massive.
D)
Current day, as the number of galaxies, solar systems, and planets have
increased

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explanation:

b r

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the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands

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