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B. Single-celled eukaryotes that sometimes grew in colonies
C. Multi-cellular organisms that were probably autotrophic.
D. Multi-cellular organisms with an alternation of generations lifecycle.
The correct answer is B. Single-celled prokaryotes that sometimes grew in colonies
You can determine the approximate size of the DNA.
It is a trait, but is not affected by natural selection.
It is a trait that is shaped by stabilizing selection.