In 2006, scientists discovered a fossil that had scales and gills, a flat head with eyes on top like a crocodile, and fin and neck bones that would allow it to prop itself out of the water. The best explanation for this fossil is that it is:.

The correct answer is - transitional fossil between fish and amphibian.

Explanation:

Transitional fossils is a fossil that remnant of an organism or life form that shows the characters of an ancestral species and current descendant of species. These fossils are use as the evidence and study of evolution of the descendant from the ancestral group.

In this case discovered fossil had scales, gills, fin, and neck bones which helps in the proping itself out of the water. These characteristics are common in the fish and amphibian that suggested that it is a transitional fossil between fish and amphibian.

Thus, the correct answer is - transitional fossil between fish and amphibian.

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