<Li> Mammalian auditory ossicles </Li> <Tr> <Td> Evolution of various taxa (show) <Ul> <Li> Birds </Li> <Li> Butterflies </Li> <Li> Cephalopods </Li> <Li> Cetaceans </Li> <Li> Dinosaurs </Li> <Li> Fishes </Li> <Li> Fungi </Li> <Li> Humans </Li> <Li> Insects </Li> <Li> Mammals </Li> <Li> Molluscs </Li> <Li> Plants </Li> <Li> Reptiles </Li> <Li> Sea cows </Li> <Li> Spiders </Li> <Li> Tetrapods </Li> </Ul> </Td> </Tr> <Ul> <Li> Birds </Li> <Li> Butterflies </Li> <Li> Cephalopods </Li> <Li> Cetaceans </Li> <Li> Dinosaurs </Li> <Li> Fishes </Li> <Li> Fungi </Li> <Li> Humans </Li> <Li> Insects </Li> <Li> Mammals </Li> <Li> Molluscs </Li> <Li> Plants </Li> <Li> Reptiles </Li> <Li> Sea cows </Li> <Li> Spiders </Li> <Li> Tetrapods </Li> </Ul> <Tr> <Td> Evolution (show) <Ul> <Li> Introduction to evolution </Li> <Li> Common descent </Li> <Li> Phylogeny </Li> <Li> Cladistics </Li> <Li> Biological classification </Li> </Ul> </Td> </Tr>

Which of the following explains the main focus of the field of geology called paleontology