Scientists combine evidence from fossils, body structures, early development, DNA, and protein structures to:a. determine what bones an animal has in its forelimbs. b. determine the evolutionary relationships among species. c. decide which fossils are older than others. d. determine whether an organism will have gills during its early development.

b. determine the evolutionary relationships among species

Explanation:

Biologists through the analysis of characters obtained from molecular, morphological, embryological, physiological and behavioral analyzes look for the relationship between species and their origin.Through these coincidences phylogenetic trees are made.

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it would be c. xylem.