Passage Summary: We rarely find dinosaur bones and footprints in the same place. The researcher thinks this is because the footprints were made in mud flats where scavengers hung out to eat the dead dinosaurs.

Conclusion: The scarcity of dinosaur bones found alongside dinosaur tracks is likely due to scavengers eating the remains at mud flats.

Reasoning: Dinosaur tracks are found in mud flats, and scavengers likely visited these areas to feed on carcasses.

Analysis: To strengthen this argument, we need to solidify the link between the presence of scavengers and the disappearance of bones. The researcher assumes that if a scavenger is present at the mud flat, the bones won't be preserved there. Look for an answer choice that confirms scavengers either destroyed the bones or moved them away from the mud flats. If scavengers typically leave the bones exactly where they found them, the researcher's explanation would fall apart.