Fossils are used to study is the answer organisms that once lived how ancient animals behaved phylogentic trees organisms that live today
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The answer is organisms that once lived and how ancient animals behaved. Fossils provide valuable information about the past, including the organisms that existed in previous geological time periods and their behavior in ancient ecosystems. They serve as physical evidence of extinct organisms and can be used to reconstruct the evolutionary history of different species through the construction of phylogenetic trees. Fossils also help scientists understand the relationships and similarities between extinct organisms and the organisms that live today.