Question

based on the map and fossil information shown, choose the best index fossil.

Explanation:

To determine the best index fossil, we look for a fossil that is widely distributed (appears in many locations) and has a short geological time range. The fossil with the stick - like structure (the one with 6 - 7 occurrences) is more widespread compared to others. Index fossils need to be easily recognizable, widespread, and exist for a short time to help date rock layers. This fossil's wide distribution across the landmasses (as seen on the map) makes it a better candidate.

Answer:

The fossil with the stick - like structure (the one with multiple occurrences in the lower - right landmass and other areas, appearing around 6 - 7 times)