( ( At ( the ( same time ) ) ) ( , ( ( trace fossils ) ( ( ( ( increased ( in ( ( diversity and ) abundance ) ) ) , ) ( including ( ( the ( first ( trace fossils ) ) ) ( that ( reflect ( ( the presence ) ( of ( animals ( with limbs ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN At) (NP (DT the) (JJ same) (NN time))) (, ,) (NP (JJ trace) (NNS fossils)) (VP (VBD increased) (PP (IN in) (NP (NN diversity) (CC and) (NN abundance))) (, ,) (PP (VBG including) (NP (NP (DT the) (JJ first) (CD trace) (NNS fossils)) (SBAR (WHNP (WDT that)) (S (VP (VBP reflect) (NP (NP (DT the) (NN presence)) (PP (IN of) (NP (NP (NNS animals)) (PP (IN with) (NP (NNS limbs)))))))))))) (. .)))
At the same time, trace fossils increased in diversity and abundance, including the first trace fossils that reflect the presence of animals with limbs.
(ROOT (S (NP (NP (DT The) (NN presence)) (PP (IN of) (NP (NP (DT an) (NN animal) (NN fossil)) (PP (IN in) (NP (DT a) (NN rock)))))) (VP (VBZ gives) (NP (NP (NN evidence)) (PP (IN of) (NP (DT the) (NN time) (NN period)))) (NP (NP (DT the) (NN animal)) (VP (VBN lived) (PP (IN in))))) (. .)))
The presence of an animal fossil in a rock gives evidence of the time period the animal lived in.