( ( Today scientists ) ( ( know ( that ( ( animal coloration ) ( has ( ( ( two ( primary causes ) ) : ) ( ( ( to ( ( provide concealment ) ( from predators ) ) ) and ) ( to ( attract mates ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NN Today) (NNS scientists)) (VP (VBP know) (SBAR (IN that) (S (NP (NN animal) (NN coloration)) (VP (VBZ has) (NP (NP (CD two) (JJ primary) (NNS causes)) (: :) (S (VP (VP (TO to) (VP (VB provide) (NP (NN concealment)) (PP (IN from) (NP (NNS predators))))) (CC and) (VP (TO to) (VP (VB attract) (NP (NNS mates))))))))))) (. .)))
Today scientists know that animal coloration has two primary causes: to provide concealment from predators and to attract mates.
(ROOT (S (NP (NNP Coloration)) (ADVP (RB often)) (VP (VBZ helps) (S (NP (DT an) (NN animal)) (VP (VB attract) (NP (DT a) (NN mate))))) (. .)))