occurring, found, or done often
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If two organisms share an evolutionary relationship, that means that they have a common ancestor on the evolutionary tree. The more recently the shared common ancestor lived, the more closely related the two present organisms are, evolutionarily.
A specific noun means to be more descriptive than a general noun; for example the zoo, or the zoo in Utah; a dog, or a poodle, or even a miniature poodle; a country or specifically France.
No, OB is not common sense.
They mean the same thing.
Not always, but most common that you will be pregnant.