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Why does this matter?
Now you know how scientists figure out evolutionary relationships between small groups of organisms. Because each organism has arisen from a single, 3.8 billion year old ancestor, we're all part of one great tree of life.
Understanding the evolutionary relationships between the members of this family helps us understand how we, and all the diverse life forms around us, have come to be. It helps us recognize the similarities that come from common ancestry, and the differences that reflect historical separations. And, perhaps, it will provide us with a greater respect for our fellow living things, because we're all in this family together.
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