( Life ( ( evolved ( ( ( ( ( at least ) 3.85 ) billion ) years ) ago ) ) . ) )
(ROOT (S (NP (NNP Life)) (VP (VBD evolved) (ADVP (NP (QP (IN at) (JJS least) (CD 3.85) (CD billion)) (NNS years)) (RB ago))) (. .)))
Life evolved at least 3.85 billion years ago.
(ROOT (S (NP (DT The) (JJ first) (VBG living) (NNS cells)) (VP (MD may) (VP (VB have) (VP (VBN evolved) (ADVP (NP (QP (RB around) (CD 4) (CD billion)) (NNS years)) (RB ago))))) (. .)))